Merge remote-tracking branch 'remotes/armbru/tags/pull-error-2016-06-20' into staging

Error reporting patches for 2016-06-20

# gpg: Signature made Mon 20 Jun 2016 15:56:15 BST
# gpg:                using RSA key 0x3870B400EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-error-2016-06-20:
  log: Fix qemu_set_log_filename() error handling
  log: Fix qemu_set_dfilter_ranges() error reporting
  log: Plug memory leak on multiple -dfilter
  coccinelle: Remove unnecessary variables for function return value
  error: Remove unnecessary local_err variables
  error: Remove NULL checks on error_propagate() calls
  vl: Error messages need to go to stderr, fix some

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

68 files changed, 265 insertions, 478 deletions

diff --git a/audio/audio.c b/audio/audio.c
index e60c124..9d4dcc7 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -1131,8 +1131,6 @@ static void audio_timer (void *opaque)
  */
 int AUD_write (SWVoiceOut *sw, void *buf, int size)
 {
-    int bytes;
-
     if (!sw) {
         /* XXX: Consider options */
         return size;
@@ -1143,14 +1141,11 @@ int AUD_write (SWVoiceOut *sw, void *buf, int size)
         return 0;
     }
 
-    bytes = sw->hw->pcm_ops->write (sw, buf, size);
-    return bytes;
+    return sw->hw->pcm_ops->write(sw, buf, size);
 }
 
 int AUD_read (SWVoiceIn *sw, void *buf, int size)
 {
-    int bytes;
-
     if (!sw) {
         /* XXX: Consider options */
         return size;
@@ -1161,8 +1156,7 @@ int AUD_read (SWVoiceIn *sw, void *buf, int size)
         return 0;
     }
 
-    bytes = sw->hw->pcm_ops->read (sw, buf, size);
-    return bytes;
+    return sw->hw->pcm_ops->read(sw, buf, size);
 }
 
 int AUD_get_buffer_size_out (SWVoiceOut *sw)
diff --git a/block.c b/block.c
index c0ccc27..f4648e9 100644
--- a/block.c
+++ b/block.c
@@ -301,9 +301,7 @@ static void coroutine_fn bdrv_create_co_entry(void *opaque)
     assert(cco->drv);
 
     ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err);
-    if (local_err) {
-        error_propagate(&cco->err, local_err);
-    }
+    error_propagate(&cco->err, local_err);
     cco->ret = ret;
 }
 
@@ -364,9 +362,7 @@ int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp)
     }
 
     ret = bdrv_create(drv, filename, opts, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
     return ret;
 }
 
@@ -1763,18 +1759,14 @@ fail:
     QDECREF(options);
     bs->options = NULL;
     bdrv_unref(bs);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
     return NULL;
 
 close_and_fail:
     bdrv_unref(bs);
     QDECREF(snapshot_options);
     QDECREF(options);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
     return NULL;
 }
 
@@ -3599,9 +3591,7 @@ void bdrv_img_create(const char *filename, const char *fmt,
 out:
     qemu_opts_del(opts);
     qemu_opts_free(create_opts);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 }
 
 AioContext *bdrv_get_aio_context(BlockDriverState *bs)
diff --git a/block/archipelago.c b/block/archipelago.c
index b9f5e69..37b8aca 100644
--- a/block/archipelago.c
+++ b/block/archipelago.c
@@ -974,11 +974,9 @@ err_exit2:
 
 static int64_t qemu_archipelago_getlength(BlockDriverState *bs)
 {
-    int64_t ret;
     BDRVArchipelagoState *s = bs->opaque;
 
-    ret = archipelago_volume_info(s);
-    return ret;
+    return archipelago_volume_info(s);
 }
 
 static int qemu_archipelago_truncate(BlockDriverState *bs, int64_t offset)
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 893ddf6..0fb4356 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -154,11 +154,9 @@ static int l2_load(BlockDriverState *bs, uint64_t l2_offset,
     uint64_t **l2_table)
 {
     BDRVQcow2State *s = bs->opaque;
-    int ret;
-
-    ret = qcow2_cache_get(bs, s->l2_table_cache, l2_offset, (void**) l2_table);
 
-    return ret;
+    return qcow2_cache_get(bs, s->l2_table_cache, l2_offset,
+                           (void **)l2_table);
 }
 
 /*
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 66f187a..3bef410 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -218,13 +218,10 @@ static int load_refcount_block(BlockDriverState *bs,
                                void **refcount_block)
 {
     BDRVQcow2State *s = bs->opaque;
-    int ret;
 
     BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_LOAD);
-    ret = qcow2_cache_get(bs, s->refcount_block_cache, refcount_block_offset,
-        refcount_block);
-
-    return ret;
+    return qcow2_cache_get(bs, s->refcount_block_cache, refcount_block_offset,
+                           refcount_block);
 }
 
 /*
diff --git a/block/qcow2.c b/block/qcow2.c
index 4718f82..23f666d 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2403,9 +2403,7 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
     ret = qcow2_create2(filename, size, backing_file, backing_fmt, flags,
                         cluster_size, prealloc, opts, version, refcount_order,
                         &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 
 finish:
     g_free(backing_file);
diff --git a/block/quorum.c b/block/quorum.c
index ec6f3b9..331b726 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -971,9 +971,7 @@ close_exit:
 exit:
     qemu_opts_del(opts);
     /* propagate error */
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
     return ret;
 }
 
diff --git a/block/raw-posix.c b/block/raw-posix.c
index aacf132..bef7a67 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -582,15 +582,9 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
                     Error **errp)
 {
     BDRVRawState *s = bs->opaque;
-    Error *local_err = NULL;
-    int ret;
 
     s->type = FTYPE_FILE;
-    ret = raw_open_common(bs, options, flags, 0, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
-    return ret;
+    return raw_open_common(bs, options, flags, 0, errp);
 }
 
 static int raw_reopen_prepare(BDRVReopenState *state,
@@ -2236,9 +2230,7 @@ hdev_open_Mac_error:
 
     ret = raw_open_common(bs, options, flags, 0, &local_err);
     if (ret < 0) {
-        if (local_err) {
-            error_propagate(errp, local_err);
-        }
+        error_propagate(errp, local_err);
 #if defined(__APPLE__) && defined(__MACH__)
         if (*bsd_path) {
             filename = bsd_path;
@@ -2443,17 +2435,11 @@ static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
                       Error **errp)
 {
     BDRVRawState *s = bs->opaque;
-    Error *local_err = NULL;
-    int ret;
 
     s->type = FTYPE_CD;
 
     /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
-    ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
-    return ret;
+    return raw_open_common(bs, options, flags, O_NONBLOCK, errp);
 }
 
 static int cdrom_probe_device(const char *filename)
@@ -2571,9 +2557,7 @@ static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
 
     ret = raw_open_common(bs, options, flags, 0, &local_err);
     if (ret) {
-        if (local_err) {
-            error_propagate(errp, local_err);
-        }
+        error_propagate(errp, local_err);
         return ret;
     }
 
diff --git a/block/raw_bsd.c b/block/raw_bsd.c
index b1d5237..7f63791 100644
--- a/block/raw_bsd.c
+++ b/block/raw_bsd.c
@@ -190,14 +190,7 @@ static int raw_has_zero_init(BlockDriverState *bs)
 
 static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
 {
-    Error *local_err = NULL;
-    int ret;
-
-    ret = bdrv_create_file(filename, opts, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
-    return ret;
+    return bdrv_create_file(filename, opts, errp);
 }
 
 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
diff --git a/block/rbd.c b/block/rbd.c
index 5226b6f..0a5840d 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -883,10 +883,8 @@ static int qemu_rbd_snap_rollback(BlockDriverState *bs,
                                   const char *snapshot_name)
 {
     BDRVRBDState *s = bs->opaque;
-    int r;
 
-    r = rbd_snap_rollback(s->image, snapshot_name);
-    return r;
+    return rbd_snap_rollback(s->image, snapshot_name);
 }
 
 static int qemu_rbd_snap_list(BlockDriverState *bs,
diff --git a/block/snapshot.c b/block/snapshot.c
index da89d2b..bf5c2ca 100644
--- a/block/snapshot.c
+++ b/block/snapshot.c
@@ -358,9 +358,7 @@ int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs,
         ret = bdrv_snapshot_load_tmp(bs, NULL, id_or_name, &local_err);
     }
 
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 
     return ret;
 }
diff --git a/block/vmdk.c b/block/vmdk.c
index ee09423..2901692 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1260,15 +1260,13 @@ static VmdkExtent *find_extent(BDRVVmdkState *s,
 static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent,
                                                    int64_t offset)
 {
-    uint64_t offset_in_cluster, extent_begin_offset, extent_relative_offset;
+    uint64_t extent_begin_offset, extent_relative_offset;
     uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE;
 
     extent_begin_offset =
         (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE;
     extent_relative_offset = offset - extent_begin_offset;
-    offset_in_cluster = extent_relative_offset % cluster_size;
-
-    return offset_in_cluster;
+    return extent_relative_offset % cluster_size;
 }
 
 static inline uint64_t vmdk_find_index_in_cluster(VmdkExtent *extent,
diff --git a/block/vvfat.c b/block/vvfat.c
index 6d2e21c..5569450 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -114,15 +114,12 @@ static inline int array_ensure_allocated(array_t* array, int index)
 
 static inline void* array_get_next(array_t* array) {
     unsigned int next = array->next;
-    void* result;
 
     if (array_ensure_allocated(array, next) < 0)
 	return NULL;
 
     array->next = next + 1;
-    result = array_get(array, next);
-
-    return result;
+    return array_get(array, next);
 }
 
 static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) {
diff --git a/blockdev.c b/blockdev.c
index 7299312..3a104a0 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -3644,9 +3644,7 @@ void qmp_drive_mirror(const char *device, const char *target,
                            has_unmap, unmap,
                            &local_err);
     bdrv_unref(target_bs);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 out:
     aio_context_release(aio_context);
 }
@@ -3701,9 +3699,7 @@ void qmp_blockdev_mirror(const char *device, const char *target,
                            has_on_target_error, on_target_error,
                            true, true,
                            &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 
     aio_context_release(aio_context);
 }
@@ -3914,9 +3910,7 @@ void qmp_change_backing_file(const char *device,
 
     if (ro) {
         bdrv_reopen(image_bs, open_flags, &local_err);
-        if (local_err) {
-            error_propagate(errp, local_err); /* will preserve prior errp */
-        }
+        error_propagate(errp, local_err);
     }
 
 out:
diff --git a/bootdevice.c b/bootdevice.c
index bb9c08e..33e3029 100644
--- a/bootdevice.c
+++ b/bootdevice.c
@@ -302,9 +302,7 @@ static void device_set_bootindex(Object *obj, Visitor *v, const char *name,
     add_boot_device_path(*prop->bootindex, prop->dev, prop->suffix);
 
 out:
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 }
 
 static void property_release_bootindex(Object *obj, const char *name,
diff --git a/bsd-user/main.c b/bsd-user/main.c
index abe9a26..4819b9e 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -19,6 +19,7 @@
 #include "qemu/osdep.h"
 #include <machine/trap.h>
 
+#include "qapi/error.h"
 #include "qemu.h"
 #include "qemu/path.h"
 #include "qemu/help_option.h"
@@ -847,7 +848,7 @@ int main(int argc, char **argv)
 
     /* init debug */
     qemu_log_needs_buffers();
-    qemu_set_log_filename(log_file);
+    qemu_set_log_filename(log_file, &error_fatal);
     if (log_mask) {
         int mask;
 
diff --git a/dump.c b/dump.c
index 9726f1f..f7b80d8 100644
--- a/dump.c
+++ b/dump.c
@@ -918,9 +918,7 @@ static void write_dump_header(DumpState *s, Error **errp)
     } else {
         create_header64(s, &local_err);
     }
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 }
 
 static size_t dump_bitmap_get_bufsize(DumpState *s)
diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 123160a..874e473 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -324,12 +324,9 @@ static void aml_free(gpointer data, gpointer user_data)
 
 Aml *init_aml_allocator(void)
 {
-    Aml *var;
-
     assert(!alloc_list);
     alloc_list = g_ptr_array_new();
-    var = aml_alloc();
-    return var;
+    return aml_alloc();
 }
 
 void free_aml_allocator(void)
@@ -451,12 +448,10 @@ Aml *aml_name_decl(const char *name, Aml *val)
 /* ACPI 1.0b: 16.2.6.1 Arg Objects Encoding */
 Aml *aml_arg(int pos)
 {
-    Aml *var;
     uint8_t op = 0x68 /* ARG0 op */ + pos;
 
     assert(pos <= 6);
-    var = aml_opcode(op);
-    return var;
+    return aml_opcode(op);
 }
 
 /* ACPI 2.0a: 17.2.4.4 Type 2 Opcodes Encoding: DefToInteger */
@@ -1082,12 +1077,10 @@ Aml *aml_string(const char *name_format, ...)
 /* ACPI 1.0b: 16.2.6.2 Local Objects Encoding */
 Aml *aml_local(int num)
 {
-    Aml *var;
     uint8_t op = 0x60 /* Local0Op */ + num;
 
     assert(num <= 7);
-    var = aml_opcode(op);
-    return var;
+    return aml_opcode(op);
 }
 
 /* ACPI 2.0a: 17.2.2 Data Objects Encoding: DefVarPackage */
diff --git a/hw/audio/intel-hda.c b/hw/audio/intel-hda.c
index 93d7669..098b17d 100644
--- a/hw/audio/intel-hda.c
+++ b/hw/audio/intel-hda.c
@@ -219,10 +219,7 @@ static void intel_hda_reset(DeviceState *dev);
 
 static hwaddr intel_hda_addr(uint32_t lbase, uint32_t ubase)
 {
-    hwaddr addr;
-
-    addr = ((uint64_t)ubase << 32) | lbase;
-    return addr;
+    return ((uint64_t)ubase << 32) | lbase;
 }
 
 static void intel_hda_update_int_sts(IntelHDAState *d)
diff --git a/hw/display/vga.c b/hw/display/vga.c
index 9ebc54f..2a88b3c 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -700,9 +700,7 @@ static void vbe_update_vgaregs(VGACommonState *s)
 static uint32_t vbe_ioport_read_index(void *opaque, uint32_t addr)
 {
     VGACommonState *s = opaque;
-    uint32_t val;
-    val = s->vbe_index;
-    return val;
+    return s->vbe_index;
 }
 
 uint32_t vbe_ioport_read_data(void *opaque, uint32_t addr)
diff --git a/hw/ide/qdev.c b/hw/ide/qdev.c
index 4bc74a3..6842a55 100644
--- a/hw/ide/qdev.c
+++ b/hw/ide/qdev.c
@@ -233,9 +233,7 @@ static void ide_dev_set_bootindex(Object *obj, Visitor *v, const char *name,
                              d->unit ? "/disk@1" : "/disk@0");
     }
 out:
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 }
 
 static void ide_dev_instance_init(Object *obj)
diff --git a/hw/intc/s390_flic_kvm.c b/hw/intc/s390_flic_kvm.c
index 680857f..fef8080 100644
--- a/hw/intc/s390_flic_kvm.c
+++ b/hw/intc/s390_flic_kvm.c
@@ -195,7 +195,7 @@ static int kvm_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
         .swap = swap,
     };
     KVMS390FLICState *flic = KVM_S390_FLIC(fs);
-    int r, ret;
+    int r;
     struct kvm_device_attr attr = {
         .group = KVM_DEV_FLIC_ADAPTER_REGISTER,
         .addr = (uint64_t)&adapter,
@@ -208,8 +208,7 @@ static int kvm_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
 
     r = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
 
-    ret = r ? -errno : 0;
-    return ret;
+    return r ? -errno : 0;
 }
 
 static int kvm_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
diff --git a/hw/net/ne2000-isa.c b/hw/net/ne2000-isa.c
index a7f5a94..8fab7ae 100644
--- a/hw/net/ne2000-isa.c
+++ b/hw/net/ne2000-isa.c
@@ -127,9 +127,7 @@ static void isa_ne2000_set_bootindex(Object *obj, Visitor *v,
     s->c.bootindex = boot_index;
 
 out:
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 }
 
 static void isa_ne2000_instance_init(Object *obj)
diff --git a/hw/pci-host/uninorth.c b/hw/pci-host/uninorth.c
index 15b1054..7aac4d6 100644
--- a/hw/pci-host/uninorth.c
+++ b/hw/pci-host/uninorth.c
@@ -62,12 +62,9 @@ typedef struct UNINState {
 
 static int pci_unin_map_irq(PCIDevice *pci_dev, int irq_num)
 {
-    int retval;
     int devfn = pci_dev->devfn & 0x00FFFFFF;
 
-    retval = (((devfn >> 11) & 0x1F) + irq_num) & 3;
-
-    return retval;
+    return (((devfn >> 11) & 0x1F) + irq_num) & 3;
 }
 
 static void pci_unin_set_irq(void *opaque, int irq_num, int level)
diff --git a/hw/ppc/spapr_vio.c b/hw/ppc/spapr_vio.c
index 3d9b9c6..ae40db8 100644
--- a/hw/ppc/spapr_vio.c
+++ b/hw/ppc/spapr_vio.c
@@ -57,12 +57,9 @@ static char *spapr_vio_get_dev_name(DeviceState *qdev)
 {
     VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev);
     VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
-    char *name;
 
     /* Device tree style name device@reg */
-    name = g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
-
-    return name;
+    return g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
 }
 
 static void spapr_vio_bus_class_init(ObjectClass *klass, void *data)
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index e257ca5..52f079a 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -180,10 +180,8 @@ static HotplugHandler *s390_get_hotplug_handler(MachineState *machine,
 static void s390_hot_add_cpu(const int64_t id, Error **errp)
 {
     MachineState *machine = MACHINE(qdev_get_machine());
-    Error *err = NULL;
 
-    s390x_new_cpu(machine->cpu_model, id, &err);
-    error_propagate(errp, err);
+    s390x_new_cpu(machine->cpu_model, id, errp);
 }
 
 static void ccw_machine_class_init(ObjectClass *oc, void *data)
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 2192be8..1625e6b 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -884,15 +884,11 @@ static void virtio_ccw_net_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     DeviceState *qdev = DEVICE(ccw_dev);
     VirtIONetCcw *dev = VIRTIO_NET_CCW(ccw_dev);
     DeviceState *vdev = DEVICE(&dev->vdev);
-    Error *err = NULL;
 
     virtio_net_set_netclient_name(&dev->vdev, qdev->id,
                                   object_get_typename(OBJECT(qdev)));
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
-    object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
-        error_propagate(errp, err);
-    }
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
 }
 
 static void virtio_ccw_net_instance_init(Object *obj)
@@ -909,13 +905,9 @@ static void virtio_ccw_blk_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 {
     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(ccw_dev);
     DeviceState *vdev = DEVICE(&dev->vdev);
-    Error *err = NULL;
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
-    object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
-        error_propagate(errp, err);
-    }
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
 }
 
 static void virtio_ccw_blk_instance_init(Object *obj)
@@ -935,7 +927,6 @@ static void virtio_ccw_serial_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(ccw_dev);
     DeviceState *vdev = DEVICE(&dev->vdev);
     DeviceState *proxy = DEVICE(ccw_dev);
-    Error *err = NULL;
     char *bus_name;
 
     /*
@@ -949,10 +940,7 @@ static void virtio_ccw_serial_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     }
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
-    object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
-        error_propagate(errp, err);
-    }
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
 }
 
 
@@ -968,13 +956,9 @@ static void virtio_ccw_balloon_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 {
     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(ccw_dev);
     DeviceState *vdev = DEVICE(&dev->vdev);
-    Error *err = NULL;
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
-    object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
-        error_propagate(errp, err);
-    }
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
 }
 
 static void virtio_ccw_balloon_instance_init(Object *obj)
@@ -995,7 +979,6 @@ static void virtio_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(ccw_dev);
     DeviceState *vdev = DEVICE(&dev->vdev);
     DeviceState *qdev = DEVICE(ccw_dev);
-    Error *err = NULL;
     char *bus_name;
 
     /*
@@ -1009,10 +992,7 @@ static void virtio_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
     }
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
-    object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
-        error_propagate(errp, err);
-    }
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
 }
 
 static void virtio_ccw_scsi_instance_init(Object *obj)
@@ -1030,13 +1010,9 @@ static void vhost_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 {
     VHostSCSICcw *dev = VHOST_SCSI_CCW(ccw_dev);
     DeviceState *vdev = DEVICE(&dev->vdev);
-    Error *err = NULL;
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
-    object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
-        error_propagate(errp, err);
-    }
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
 }
 
 static void vhost_ccw_scsi_instance_init(Object *obj)
@@ -1854,13 +1830,9 @@ static void virtio_ccw_9p_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 {
     V9fsCCWState *dev = VIRTIO_9P_CCW(ccw_dev);
     DeviceState *vdev = DEVICE(&dev->vdev);
-    Error *err = NULL;
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
-    object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
-        error_propagate(errp, err);
-    }
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
 }
 
 static void virtio_ccw_9p_class_init(ObjectClass *klass, void *data)
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index a9ffc32..d177218 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -410,17 +410,14 @@ static void megasas_encode_lba(uint8_t *cdb, uint64_t lba,
 static uint64_t megasas_fw_time(void)
 {
     struct tm curtime;
-    uint64_t bcd_time;
 
     qemu_get_timedate(&curtime, 0);
-    bcd_time = ((uint64_t)curtime.tm_sec & 0xff) << 48 |
+    return ((uint64_t)curtime.tm_sec & 0xff) << 48 |
         ((uint64_t)curtime.tm_min & 0xff)  << 40 |
         ((uint64_t)curtime.tm_hour & 0xff) << 32 |
         ((uint64_t)curtime.tm_mday & 0xff) << 24 |
         ((uint64_t)curtime.tm_mon & 0xff)  << 16 |
         ((uint64_t)(curtime.tm_year + 1900) & 0xffff);
-
-    return bcd_time;
 }
 
 /*
diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 71372a8..6a2d89a 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -579,10 +579,7 @@ const SCSIReqOps scsi_generic_req_ops = {
 static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun,
                                      uint8_t *buf, void *hba_private)
 {
-    SCSIRequest *req;
-
-    req = scsi_req_alloc(&scsi_generic_req_ops, d, tag, lun, hba_private);
-    return req;
+    return scsi_req_alloc(&scsi_generic_req_ops, d, tag, lun, hba_private);
 }
 
 static Property scsi_generic_properties[] = {
diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c
index a11b8b4..f4e333e 100644
--- a/hw/timer/mc146818rtc.c
+++ b/hw/timer/mc146818rtc.c
@@ -105,12 +105,10 @@ static inline bool rtc_running(RTCState *s)
 
 static uint64_t get_guest_rtc_ns(RTCState *s)
 {
-    uint64_t guest_rtc;
     uint64_t guest_clock = qemu_clock_get_ns(rtc_clock);
 
-    guest_rtc = s->base_rtc * NANOSECONDS_PER_SECOND +
+    return s->base_rtc * NANOSECONDS_PER_SECOND +
         guest_clock - s->last_update + s->offset;
-    return guest_rtc;
 }
 
 #ifdef TARGET_I386
diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c
index 248a580..9fd00df 100644
--- a/hw/usb/dev-storage.c
+++ b/hw/usb/dev-storage.c
@@ -818,9 +818,7 @@ static void usb_msd_set_bootindex(Object *obj, Visitor *v, const char *name,
     }
 
 out:
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 }
 
 static const TypeInfo usb_storage_dev_type_info = {
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index bfedbbf..1a02783 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -761,9 +761,7 @@ static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
-    int ret;
-    ret = kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq);
-    return ret;
+    return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq);
 }
 
 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
diff --git a/include/qemu/log.h b/include/qemu/log.h
index 234fa81..8bec6b4 100644
--- a/include/qemu/log.h
+++ b/include/qemu/log.h
@@ -106,8 +106,8 @@ extern const QEMULogItem qemu_log_items[];
 
 void qemu_set_log(int log_flags);
 void qemu_log_needs_buffers(void);
-void qemu_set_log_filename(const char *filename);
-void qemu_set_dfilter_ranges(const char *ranges);
+void qemu_set_log_filename(const char *filename, Error **errp);
+void qemu_set_dfilter_ranges(const char *ranges, Error **errp);
 bool qemu_log_in_addr_range(uint64_t addr);
 int qemu_str_to_log_mask(const char *str);
 
diff --git a/linux-user/main.c b/linux-user/main.c
index b9a4e0e..358ed01 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -21,6 +21,7 @@
 #include <sys/syscall.h>
 #include <sys/resource.h>
 
+#include "qapi/error.h"
 #include "qemu.h"
 #include "qemu/path.h"
 #include "qemu/cutils.h"
@@ -3845,7 +3846,7 @@ static void handle_arg_log(const char *arg)
 
 static void handle_arg_log_filename(const char *arg)
 {
-    qemu_set_log_filename(arg);
+    qemu_set_log_filename(arg, &error_fatal);
 }
 
 static void handle_arg_set_env(const char *arg)
diff --git a/linux-user/signal.c b/linux-user/signal.c
index 61c1145..1dadddf 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -195,7 +195,6 @@ int block_signals(void)
 {
     TaskState *ts = (TaskState *)thread_cpu->opaque;
     sigset_t set;
-    int pending;
 
     /* It's OK to block everything including SIGSEGV, because we won't
      * run any further guest code before unblocking signals in
@@ -204,9 +203,7 @@ int block_signals(void)
     sigfillset(&set);
     sigprocmask(SIG_SETMASK, &set, 0);
 
-    pending = atomic_xchg(&ts->signal_pending, 1);
-
-    return pending;
+    return atomic_xchg(&ts->signal_pending, 1);
 }
 
 /* Wrapper for sigprocmask function
@@ -3956,9 +3953,7 @@ static void setup_sigcontext(struct target_sigcontext *sc,
 
 static inline unsigned long align_sigframe(unsigned long sp)
 {
-    unsigned long i;
-    i = sp & ~3UL;
-    return i;
+    return sp & ~3UL;
 }
 
 static inline abi_ulong get_sigframe(struct target_sigaction *ka,
@@ -4555,7 +4550,7 @@ static target_ulong get_sigframe(struct target_sigaction *ka,
                                  CPUPPCState *env,
                                  int frame_size)
 {
-    target_ulong oldsp, newsp;
+    target_ulong oldsp;
 
     oldsp = env->gpr[1];
 
@@ -4565,9 +4560,7 @@ static target_ulong get_sigframe(struct target_sigaction *ka,
                  + target_sigaltstack_used.ss_size);
     }
 
-    newsp = (oldsp - frame_size) & ~0xFUL;
-
-    return newsp;
+    return (oldsp - frame_size) & ~0xFUL;
 }
 
 static void save_user_regs(CPUPPCState *env, struct target_mcontext *frame)
diff --git a/monitor.c b/monitor.c
index a5d054b..6f960f1 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1111,7 +1111,12 @@ void qmp_client_migrate_info(const char *protocol, const char *hostname,
 
 static void hmp_logfile(Monitor *mon, const QDict *qdict)
 {
-    qemu_set_log_filename(qdict_get_str(qdict, "filename"));
+    Error *err = NULL;
+
+    qemu_set_log_filename(qdict_get_str(qdict, "filename"), &err);
+    if (err) {
+        error_report_err(err);
+    }
 }
 
 static void hmp_log(Monitor *mon, const QDict *qdict)
diff --git a/page_cache.c b/page_cache.c
index a2809db..5f85787 100644
--- a/page_cache.c
+++ b/page_cache.c
@@ -111,11 +111,8 @@ void cache_fini(PageCache *cache)
 static size_t cache_get_cache_pos(const PageCache *cache,
                                   uint64_t address)
 {
-    size_t pos;
-
     g_assert(cache->max_num_items);
-    pos = (address / cache->page_size) & (cache->max_num_items - 1);
-    return pos;
+    return (address / cache->page_size) & (cache->max_num_items - 1);
 }
 
 static CacheItem *cache_get_by_addr(const PageCache *cache, uint64_t addr)
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index eaef7be..ea37c09 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -127,7 +127,6 @@ int64_t qmp_guest_get_time(Error **errp)
 {
    int ret;
    qemu_timeval tq;
-   int64_t time_ns;
 
    ret = qemu_gettimeofday(&tq);
    if (ret < 0) {
@@ -135,8 +134,7 @@ int64_t qmp_guest_get_time(Error **errp)
        return -1;
    }
 
-   time_ns = tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
-   return time_ns;
+   return tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
 }
 
 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index c1a8588..9c9be12 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -247,9 +247,7 @@ out:
     if (token) {
         CloseHandle(token);
     }
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 }
 
 static void execute_async(DWORD WINAPI (*func)(LPVOID), LPVOID opaque,
@@ -882,9 +880,7 @@ static void check_suspend_mode(GuestSuspendMode mode, Error **errp)
     }
 
 out:
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
 }
 
 static DWORD WINAPI do_suspend(LPVOID opaque)
@@ -1154,7 +1150,6 @@ out:
 int64_t qmp_guest_get_time(Error **errp)
 {
     SYSTEMTIME ts = {0};
-    int64_t time_ns;
     FILETIME tf;
 
     GetSystemTime(&ts);
@@ -1168,10 +1163,8 @@ int64_t qmp_guest_get_time(Error **errp)
         return -1;
     }
 
-    time_ns = ((((int64_t)tf.dwHighDateTime << 32) | tf.dwLowDateTime)
+    return ((((int64_t)tf.dwHighDateTime << 32) | tf.dwLowDateTime)
                 - W32_FT_OFFSET) * 100;
-
-    return time_ns;
 }
 
 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
diff --git a/qobject/qlist.c b/qobject/qlist.c
index 1ec74de..86b60cb 100644
--- a/qobject/qlist.c
+++ b/qobject/qlist.c
@@ -100,7 +100,6 @@ QObject *qlist_pop(QList *qlist)
 QObject *qlist_peek(QList *qlist)
 {
     QListEntry *entry;
-    QObject *ret;
 
     if (qlist == NULL || QTAILQ_EMPTY(&qlist->head)) {
         return NULL;
@@ -108,9 +107,7 @@ QObject *qlist_peek(QList *qlist)
 
     entry = QTAILQ_FIRST(&qlist->head);
 
-    ret = entry->value;
-
-    return ret;
+    return entry->value;
 }
 
 int qlist_empty(const QList *qlist)
diff --git a/qom/object.c b/qom/object.c
index 0311414..9743ea4 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -549,9 +549,7 @@ Object *object_new_with_propv(const char *typename,
     return obj;
 
  error:
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
+    error_propagate(errp, local_err);
     object_unref(obj);
     return NULL;
 }
diff --git a/scripts/coccinelle/error_propagate_null.cocci b/scripts/coccinelle/error_propagate_null.cocci
new file mode 100644
index 0000000..c236380
--- /dev/null
+++ b/scripts/coccinelle/error_propagate_null.cocci
@@ -0,0 +1,10 @@
+// error_propagate() already ignores local_err==NULL, so there's
+// no need to check it before calling.
+
+@@
+identifier L;
+expression E;
+@@
+-if (L) {
+     error_propagate(E, L);
+-}
diff --git a/scripts/coccinelle/remove_local_err.cocci b/scripts/coccinelle/remove_local_err.cocci
new file mode 100644
index 0000000..9261c99
--- /dev/null
+++ b/scripts/coccinelle/remove_local_err.cocci
@@ -0,0 +1,29 @@
+// Replace unnecessary usage of local_err variable with
+// direct usage of errp argument
+
+@@
+identifier F;
+expression list ARGS;
+expression F2;
+identifier LOCAL_ERR;
+identifier ERRP;
+idexpression V;
+typedef Error;
+@@
+ F(..., Error **ERRP)
+ {
+     ...
+-    Error *LOCAL_ERR;
+     ... when != LOCAL_ERR
+         when != ERRP
+(
+-    F2(ARGS, &LOCAL_ERR);
+-    error_propagate(ERRP, LOCAL_ERR);
++    F2(ARGS, ERRP);
+|
+-    V = F2(ARGS, &LOCAL_ERR);
+-    error_propagate(ERRP, LOCAL_ERR);
++    V = F2(ARGS, ERRP);
+)
+     ... when != LOCAL_ERR
+ }
diff --git a/scripts/coccinelle/return_directly.cocci b/scripts/coccinelle/return_directly.cocci
new file mode 100644
index 0000000..48680f2
--- /dev/null
+++ b/scripts/coccinelle/return_directly.cocci
@@ -0,0 +1,19 @@
+// replace 'R = X; return R;' with 'return R;'
+@@
+identifier VAR;
+expression E;
+type T;
+identifier F;
+@@
+ T F(...)
+ {
+     ...
+-    T VAR;
+     ... when != VAR
+
+-    VAR =
++    return
+     E;
+-    return VAR;
+     ... when != VAR
+ }
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 3665fec..3bd3cfc 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1875,7 +1875,6 @@ static void x86_cpu_get_feature_words(Object *obj, Visitor *v,
 {
     uint32_t *array = (uint32_t *)opaque;
     FeatureWord w;
-    Error *err = NULL;
     X86CPUFeatureWordInfo word_infos[FEATURE_WORDS] = { };
     X86CPUFeatureWordInfoList list_entries[FEATURE_WORDS] = { };
     X86CPUFeatureWordInfoList *list = NULL;
@@ -1895,8 +1894,7 @@ static void x86_cpu_get_feature_words(Object *obj, Visitor *v,
         list = &list_entries[w];
     }
 
-    visit_type_X86CPUFeatureWordInfoList(v, "feature-words", &list, &err);
-    error_propagate(errp, err);
+    visit_type_X86CPUFeatureWordInfoList(v, "feature-words", &list, errp);
 }
 
 static void x86_get_hv_spinlocks(Object *obj, Visitor *v, const char *name,
diff --git a/target-i386/fpu_helper.c b/target-i386/fpu_helper.c
index 206e60f..929489b 100644
--- a/target-i386/fpu_helper.c
+++ b/target-i386/fpu_helper.c
@@ -298,18 +298,12 @@ int32_t helper_fistt_ST0(CPUX86State *env)
 
 int32_t helper_fisttl_ST0(CPUX86State *env)
 {
-    int32_t val;
-
-    val = floatx80_to_int32_round_to_zero(ST0, &env->fp_status);
-    return val;
+    return floatx80_to_int32_round_to_zero(ST0, &env->fp_status);
 }
 
 int64_t helper_fisttll_ST0(CPUX86State *env)
 {
-    int64_t val;
-
-    val = floatx80_to_int64_round_to_zero(ST0, &env->fp_status);
-    return val;
+    return floatx80_to_int64_round_to_zero(ST0, &env->fp_status);
 }
 
 void helper_fldt_ST0(CPUX86State *env, target_ulong ptr)
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index ff92b1d..f3698f1 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -1346,7 +1346,7 @@ static int kvm_put_xsave(X86CPU *cpu)
     CPUX86State *env = &cpu->env;
     X86XSaveArea *xsave = env->kvm_xsave_buf;
     uint16_t cwd, swd, twd;
-    int i, r;
+    int i;
 
     if (!has_xsave) {
         return kvm_put_fpu(cpu);
@@ -1395,8 +1395,7 @@ static int kvm_put_xsave(X86CPU *cpu)
             16 * sizeof env->xmm_regs[16]);
     memcpy(&xsave->pkru_state, &env->pkru, sizeof env->pkru);
 #endif
-    r = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_XSAVE, xsave);
-    return r;
+    return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_XSAVE, xsave);
 }
 
 static int kvm_put_xcrs(X86CPU *cpu)
diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c
index 7cf9807..1ae1dda 100644
--- a/target-mips/op_helper.c
+++ b/target-mips/op_helper.c
@@ -133,10 +133,8 @@ static inline uint64_t get_HILO(CPUMIPSState *env)
 
 static inline target_ulong set_HIT0_LO(CPUMIPSState *env, uint64_t HILO)
 {
-    target_ulong tmp;
     env->active_tc.LO[0] = (int32_t)(HILO & 0xFFFFFFFF);
-    tmp = env->active_tc.HI[0] = (int32_t)(HILO >> 32);
-    return tmp;
+    return env->active_tc.HI[0] = (int32_t)(HILO >> 32);
 }
 
 static inline target_ulong set_HI_LOT0(CPUMIPSState *env, uint64_t HILO)
diff --git a/target-s390x/helper.c b/target-s390x/helper.c
index 9a744df..54a5177 100644
--- a/target-s390x/helper.c
+++ b/target-s390x/helper.c
@@ -70,11 +70,7 @@ void s390x_cpu_timer(void *opaque)
 
 S390CPU *cpu_s390x_create(const char *cpu_model, Error **errp)
 {
-    S390CPU *cpu;
-
-    cpu = S390_CPU(object_new(TYPE_S390_CPU));
-
-    return cpu;
+    return S390_CPU(object_new(TYPE_S390_CPU));
 }
 
 S390CPU *s390x_new_cpu(const char *cpu_model, int64_t id, Error **errp)
diff --git a/target-sparc/cc_helper.c b/target-sparc/cc_helper.c
index 44c4409..a410a0b 100644
--- a/target-sparc/cc_helper.c
+++ b/target-sparc/cc_helper.c
@@ -200,10 +200,7 @@ static uint32_t compute_all_addx_xcc(CPUSPARCState *env)
 
 static uint32_t compute_C_addx_xcc(CPUSPARCState *env)
 {
-    uint32_t ret;
-
-    ret = get_C_addx_xcc(CC_DST, CC_SRC, CC_SRC2);
-    return ret;
+    return get_C_addx_xcc(CC_DST, CC_SRC, CC_SRC2);
 }
 #endif
 
@@ -219,10 +216,7 @@ static uint32_t compute_all_addx(CPUSPARCState *env)
 
 static uint32_t compute_C_addx(CPUSPARCState *env)
 {
-    uint32_t ret;
-
-    ret = get_C_addx_icc(CC_DST, CC_SRC, CC_SRC2);
-    return ret;
+    return get_C_addx_icc(CC_DST, CC_SRC, CC_SRC2);
 }
 
 static inline uint32_t get_V_tag_icc(target_ulong src1, target_ulong src2)
@@ -365,10 +359,7 @@ static uint32_t compute_all_subx_xcc(CPUSPARCState *env)
 
 static uint32_t compute_C_subx_xcc(CPUSPARCState *env)
 {
-    uint32_t ret;
-
-    ret = get_C_subx_xcc(CC_DST, CC_SRC, CC_SRC2);
-    return ret;
+    return get_C_subx_xcc(CC_DST, CC_SRC, CC_SRC2);
 }
 #endif
 
@@ -384,10 +375,7 @@ static uint32_t compute_all_subx(CPUSPARCState *env)
 
 static uint32_t compute_C_subx(CPUSPARCState *env)
 {
-    uint32_t ret;
-
-    ret = get_C_subx_icc(CC_DST, CC_SRC, CC_SRC2);
-    return ret;
+    return get_C_subx_icc(CC_DST, CC_SRC, CC_SRC2);
 }
 
 static uint32_t compute_all_tsub(CPUSPARCState *env)
@@ -479,8 +467,5 @@ void helper_compute_psr(CPUSPARCState *env)
 
 uint32_t helper_compute_C_icc(CPUSPARCState *env)
 {
-    uint32_t ret;
-
-    ret = icc_table[CC_OP].compute_c(env) >> PSR_CARRY_SHIFT;
-    return ret;
+    return icc_table[CC_OP].compute_c(env) >> PSR_CARRY_SHIFT;
 }
diff --git a/target-tricore/op_helper.c b/target-tricore/op_helper.c
index a73ed53..3382a12 100644
--- a/target-tricore/op_helper.c
+++ b/target-tricore/op_helper.c
@@ -2117,7 +2117,7 @@ uint64_t helper_dvadj(uint64_t r1, uint32_t r2)
     int32_t eq_pos = x_sign & ((r1 >> 32) == r2);
     int32_t eq_neg = x_sign & ((r1 >> 32) == -r2);
     uint32_t quotient;
-    uint64_t ret, remainder;
+    uint64_t remainder;
 
     if ((q_sign & ~eq_neg) | eq_pos) {
         quotient = (r1 + 1) & 0xffffffff;
@@ -2130,8 +2130,7 @@ uint64_t helper_dvadj(uint64_t r1, uint32_t r2)
     } else {
         remainder = (r1 & 0xffffffff00000000ull);
     }
-    ret = remainder|quotient;
-    return ret;
+    return remainder | quotient;
 }
 
 uint64_t helper_dvstep(uint64_t r1, uint32_t r2)
@@ -2236,7 +2235,6 @@ uint64_t helper_divide_u(CPUTriCoreState *env, uint32_t r1, uint32_t r2)
 uint64_t helper_mul_h(uint32_t arg00, uint32_t arg01,
                       uint32_t arg10, uint32_t arg11, uint32_t n)
 {
-    uint64_t ret;
     uint32_t result0, result1;
 
     int32_t sc1 = ((arg00 & 0xffff) == 0x8000) &&
@@ -2253,8 +2251,7 @@ uint64_t helper_mul_h(uint32_t arg00, uint32_t arg01,
     } else {
         result0 = (((uint32_t)(arg01 * arg11)) << n);
     }
-    ret = (((uint64_t)result1 << 32)) | result0;
-    return ret;
+    return (((uint64_t)result1 << 32)) | result0;
 }
 
 uint64_t helper_mulm_h(uint32_t arg00, uint32_t arg01,
@@ -2308,11 +2305,9 @@ uint32_t helper_mulr_h(uint32_t arg00, uint32_t arg01,
 uint32_t helper_crc32(uint32_t arg0, uint32_t arg1)
 {
     uint8_t buf[4];
-    uint32_t ret;
     stl_be_p(buf, arg0);
 
-    ret = crc32(arg1, buf, 4);
-    return ret;
+    return crc32(arg1, buf, 4);
 }
 
 /* context save area (CSA) related helpers */
diff --git a/tests/display-vga-test.c b/tests/display-vga-test.c
index 06b244e..9146021 100644
--- a/tests/display-vga-test.c
+++ b/tests/display-vga-test.c
@@ -50,8 +50,6 @@ static void pci_virtio_vga(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
 
     qtest_add_func("/display/pci/cirrus", pci_cirrus);
@@ -62,7 +60,5 @@ int main(int argc, char **argv)
 #ifdef CONFIG_VIRTIO_VGA
     qtest_add_func("/display/pci/virtio-vga", pci_virtio_vga);
 #endif
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }
diff --git a/tests/endianness-test.c b/tests/endianness-test.c
index 2197972..b7a120e 100644
--- a/tests/endianness-test.c
+++ b/tests/endianness-test.c
@@ -282,7 +282,6 @@ static void test_endianness_combine(gconstpointer data)
 int main(int argc, char **argv)
 {
     const char *arch = qtest_get_arch();
-    int ret;
     int i;
 
     g_test_init(&argc, &argv, NULL);
@@ -305,7 +304,5 @@ int main(int argc, char **argv)
         qtest_add_data_func(path, &test_cases[i], test_endianness_combine);
     }
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }
diff --git a/tests/i440fx-test.c b/tests/i440fx-test.c
index c1d9b3e..3542ad1 100644
--- a/tests/i440fx-test.c
+++ b/tests/i440fx-test.c
@@ -394,7 +394,6 @@ static void request_pflash(FirmwareTestFixture *fixture,
 int main(int argc, char **argv)
 {
     TestData data;
-    int ret;
 
     g_test_init(&argc, &argv, NULL);
 
@@ -405,6 +404,5 @@ int main(int argc, char **argv)
     add_firmware_test("i440fx/firmware/bios", request_bios);
     add_firmware_test("i440fx/firmware/pflash", request_pflash);
 
-    ret = g_test_run();
-    return ret;
+    return g_test_run();
 }
diff --git a/tests/intel-hda-test.c b/tests/intel-hda-test.c
index b0ca7e0..b782b2e 100644
--- a/tests/intel-hda-test.c
+++ b/tests/intel-hda-test.c
@@ -31,13 +31,9 @@ static void ich9_test(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/intel-hda/ich6", ich6_test);
     qtest_add_func("/intel-hda/ich9", ich9_test);
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }
diff --git a/tests/test-filter-redirector.c b/tests/test-filter-redirector.c
index 280e4b6..c63b68f 100644
--- a/tests/test-filter-redirector.c
+++ b/tests/test-filter-redirector.c
@@ -209,12 +209,8 @@ static void test_redirector_rx(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/netfilter/redirector_tx", test_redirector_tx);
     qtest_add_func("/netfilter/redirector_rx", test_redirector_rx);
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }
diff --git a/tests/test-logging.c b/tests/test-logging.c
index 5ef5bb8..440e75f 100644
--- a/tests/test-logging.c
+++ b/tests/test-logging.c
@@ -27,11 +27,14 @@
 #include "qemu/osdep.h"
 
 #include "qemu-common.h"
-#include "include/qemu/log.h"
+#include "qapi/error.h"
+#include "qemu/log.h"
 
 static void test_parse_range(void)
 {
-    qemu_set_dfilter_ranges("0x1000+0x100");
+    Error *err = NULL;
+
+    qemu_set_dfilter_ranges("0x1000+0x100", &error_abort);
 
     g_assert_false(qemu_log_in_addr_range(0xfff));
     g_assert(qemu_log_in_addr_range(0x1000));
@@ -39,102 +42,57 @@ static void test_parse_range(void)
     g_assert(qemu_log_in_addr_range(0x10ff));
     g_assert_false(qemu_log_in_addr_range(0x1100));
 
-    qemu_set_dfilter_ranges("0x1000-0x100");
+    qemu_set_dfilter_ranges("0x1000-0x100", &error_abort);
 
     g_assert_false(qemu_log_in_addr_range(0x1001));
     g_assert(qemu_log_in_addr_range(0x1000));
     g_assert(qemu_log_in_addr_range(0x0f01));
     g_assert_false(qemu_log_in_addr_range(0x0f00));
 
-    qemu_set_dfilter_ranges("0x1000..0x1100");
+    qemu_set_dfilter_ranges("0x1000..0x1100", &error_abort);
 
     g_assert_false(qemu_log_in_addr_range(0xfff));
     g_assert(qemu_log_in_addr_range(0x1000));
     g_assert(qemu_log_in_addr_range(0x1100));
     g_assert_false(qemu_log_in_addr_range(0x1101));
 
-    qemu_set_dfilter_ranges("0x1000..0x1000");
+    qemu_set_dfilter_ranges("0x1000..0x1000", &error_abort);
 
     g_assert_false(qemu_log_in_addr_range(0xfff));
     g_assert(qemu_log_in_addr_range(0x1000));
     g_assert_false(qemu_log_in_addr_range(0x1001));
 
-    qemu_set_dfilter_ranges("0x1000+0x100,0x2100-0x100,0x3000..0x3100");
+    qemu_set_dfilter_ranges("0x1000+0x100,0x2100-0x100,0x3000..0x3100",
+                            &error_abort);
     g_assert(qemu_log_in_addr_range(0x1050));
     g_assert(qemu_log_in_addr_range(0x2050));
     g_assert(qemu_log_in_addr_range(0x3050));
-}
 
-#ifdef CONFIG_HAS_GLIB_SUBPROCESS_TESTS
-static void test_parse_invalid_range_subprocess(void)
-{
-    qemu_set_dfilter_ranges("0x1000+onehundred");
-}
-static void test_parse_invalid_range(void)
-{
-    g_test_trap_subprocess("/logging/parse_invalid_range/subprocess", 0, 0);
-    g_test_trap_assert_failed();
-    g_test_trap_assert_stdout("");
-    g_test_trap_assert_stderr("*Failed to parse range in: 0x1000+onehundred\n");
-}
-static void test_parse_zero_range_subprocess(void)
-{
-    qemu_set_dfilter_ranges("0x1000+0");
-}
-static void test_parse_zero_range(void)
-{
-    g_test_trap_subprocess("/logging/parse_zero_range/subprocess", 0, 0);
-    g_test_trap_assert_failed();
-    g_test_trap_assert_stdout("");
-    g_test_trap_assert_stderr("*Failed to parse range in: 0x1000+0\n");
-}
+    qemu_set_dfilter_ranges("0x1000+onehundred", &err);
+    error_free_or_abort(&err);
 
-/* As the only real failure from a bad log filename path spec is
- * reporting to the user we have to use the g_test_trap_subprocess
- * mechanism and check no errors reported on stderr.
- */
-static void test_parse_path_subprocess(void)
-{
-    /* All these should work without issue */
-    qemu_set_log_filename("/tmp/qemu.log");
-    qemu_set_log_filename("/tmp/qemu-%d.log");
-    qemu_set_log_filename("/tmp/qemu.log.%d");
+    qemu_set_dfilter_ranges("0x1000+0", &err);
+    error_free_or_abort(&err);
 }
+
 static void test_parse_path(void)
 {
-    g_test_trap_subprocess ("/logging/parse_path/subprocess", 0, 0);
-    g_test_trap_assert_passed();
-    g_test_trap_assert_stdout("");
-    g_test_trap_assert_stderr("");
-}
-static void test_parse_invalid_path_subprocess(void)
-{
-    qemu_set_log_filename("/tmp/qemu-%d%d.log");
-}
-static void test_parse_invalid_path(void)
-{
-    g_test_trap_subprocess ("/logging/parse_invalid_path/subprocess", 0, 0);
-    g_test_trap_assert_passed();
-    g_test_trap_assert_stdout("");
-    g_test_trap_assert_stderr("Bad logfile format: /tmp/qemu-%d%d.log\n");
+    Error *err = NULL;
+
+    qemu_set_log_filename("/tmp/qemu.log", &error_abort);
+    qemu_set_log_filename("/tmp/qemu-%d.log", &error_abort);
+    qemu_set_log_filename("/tmp/qemu.log.%d", &error_abort);
+
+    qemu_set_log_filename("/tmp/qemu-%d%d.log", &err);
+    error_free_or_abort(&err);
 }
-#endif /* CONFIG_HAS_GLIB_SUBPROCESS_TESTS */
 
 int main(int argc, char **argv)
 {
     g_test_init(&argc, &argv, NULL);
 
     g_test_add_func("/logging/parse_range", test_parse_range);
-#ifdef CONFIG_HAS_GLIB_SUBPROCESS_TESTS
-    g_test_add_func("/logging/parse_invalid_range/subprocess", test_parse_invalid_range_subprocess);
-    g_test_add_func("/logging/parse_invalid_range", test_parse_invalid_range);
-    g_test_add_func("/logging/parse_zero_range/subprocess", test_parse_zero_range_subprocess);
-    g_test_add_func("/logging/parse_zero_range", test_parse_zero_range);
     g_test_add_func("/logging/parse_path", test_parse_path);
-    g_test_add_func("/logging/parse_path/subprocess", test_parse_path_subprocess);
-    g_test_add_func("/logging/parse_invalid_path", test_parse_invalid_path);
-    g_test_add_func("/logging/parse_invalid_path/subprocess", test_parse_invalid_path_subprocess);
-#endif
 
     return g_test_run();
 }
diff --git a/tests/virtio-blk-test.c b/tests/virtio-blk-test.c
index 4ab14d5..811cf75 100644
--- a/tests/virtio-blk-test.c
+++ b/tests/virtio-blk-test.c
@@ -753,7 +753,6 @@ static void mmio_basic(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
     const char *arch = qtest_get_arch();
 
     g_test_init(&argc, &argv, NULL);
@@ -769,7 +768,5 @@ int main(int argc, char **argv)
         qtest_add_func("/virtio/blk/mmio/basic", mmio_basic);
     }
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }
diff --git a/tests/virtio-console-test.c b/tests/virtio-console-test.c
index 6d6414d..1c3de07 100644
--- a/tests/virtio-console-test.c
+++ b/tests/virtio-console-test.c
@@ -27,13 +27,9 @@ static void serialport_pci_nop(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/virtio/console/pci/nop", console_pci_nop);
     qtest_add_func("/virtio/serialport/pci/nop", serialport_pci_nop);
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }
diff --git a/tests/virtio-net-test.c b/tests/virtio-net-test.c
index 0d2c63f..a34a939 100644
--- a/tests/virtio-net-test.c
+++ b/tests/virtio-net-test.c
@@ -250,8 +250,6 @@ static void hotplug(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
 #ifndef _WIN32
     qtest_add_data_func("/virtio/net/pci/basic", send_recv_test, pci_basic);
@@ -260,7 +258,5 @@ int main(int argc, char **argv)
 #endif
     qtest_add_func("/virtio/net/pci/hotplug", hotplug);
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }
diff --git a/tests/virtio-scsi-test.c b/tests/virtio-scsi-test.c
index cbe5dcc..f1489e6 100644
--- a/tests/virtio-scsi-test.c
+++ b/tests/virtio-scsi-test.c
@@ -247,15 +247,11 @@ static void test_unaligned_write_same(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/virtio/scsi/pci/nop", pci_nop);
     qtest_add_func("/virtio/scsi/pci/hotplug", hotplug);
     qtest_add_func("/virtio/scsi/pci/scsi-disk/unaligned-write-same",
                    test_unaligned_write_same);
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }
diff --git a/tests/wdt_ib700-test.c b/tests/wdt_ib700-test.c
index 9c1d78b..49f4f0c 100644
--- a/tests/wdt_ib700-test.c
+++ b/tests/wdt_ib700-test.c
@@ -117,15 +117,11 @@ static void ib700_none(void)
 
 int main(int argc, char **argv)
 {
-    int ret;
-
     g_test_init(&argc, &argv, NULL);
     qtest_add_func("/wdt_ib700/pause", ib700_pause);
     qtest_add_func("/wdt_ib700/reset", ib700_reset);
     qtest_add_func("/wdt_ib700/shutdown", ib700_shutdown);
     qtest_add_func("/wdt_ib700/none", ib700_none);
 
-    ret = g_test_run();
-
-    return ret;
+    return g_test_run();
 }
diff --git a/trace/control.c b/trace/control.c
index d099f73..e1556a3 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -19,6 +19,7 @@
 #ifdef CONFIG_TRACE_LOG
 #include "qemu/log.h"
 #endif
+#include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "monitor/monitor.h"
 
@@ -187,7 +188,7 @@ void trace_init_file(const char *file)
      * only applies to the simple backend; use "-D" for the log backend.
      */
     if (file) {
-        qemu_set_log_filename(file);
+        qemu_set_log_filename(file, &error_fatal);
     }
 #else
     if (file) {
diff --git a/ui/cursor.c b/ui/cursor.c
index a276e01..5155b39 100644
--- a/ui/cursor.c
+++ b/ui/cursor.c
@@ -81,18 +81,12 @@ void cursor_print_ascii_art(QEMUCursor *c, const char *prefix)
 
 QEMUCursor *cursor_builtin_hidden(void)
 {
-    QEMUCursor *c;
-
-    c = cursor_parse_xpm(cursor_hidden_xpm);
-    return c;
+    return cursor_parse_xpm(cursor_hidden_xpm);
 }
 
 QEMUCursor *cursor_builtin_left_ptr(void)
 {
-    QEMUCursor *c;
-
-    c = cursor_parse_xpm(cursor_left_ptr_xpm);
-    return c;
+    return cursor_parse_xpm(cursor_left_ptr_xpm);
 }
 
 QEMUCursor *cursor_alloc(int width, int height)
diff --git a/ui/qemu-pixman.c b/ui/qemu-pixman.c
index c9f8dce..6e8b83a 100644
--- a/ui/qemu-pixman.c
+++ b/ui/qemu-pixman.c
@@ -180,14 +180,11 @@ void qemu_pixman_linebuf_copy(pixman_image_t *fb, int width, int x, int y,
 pixman_image_t *qemu_pixman_mirror_create(pixman_format_code_t format,
                                           pixman_image_t *image)
 {
-    pixman_image_t *mirror;
-
-    mirror = pixman_image_create_bits(format,
-                                      pixman_image_get_width(image),
-                                      pixman_image_get_height(image),
-                                      NULL,
-                                      pixman_image_get_stride(image));
-    return mirror;
+    return pixman_image_create_bits(format,
+                                    pixman_image_get_width(image),
+                                    pixman_image_get_height(image),
+                                    NULL,
+                                    pixman_image_get_stride(image));
 }
 
 void qemu_pixman_image_unref(pixman_image_t *image)
diff --git a/util/log.c b/util/log.c
index 5ad72c1..32e4160 100644
--- a/util/log.c
+++ b/util/log.c
@@ -22,6 +22,7 @@
 #include "qemu/log.h"
 #include "qemu/range.h"
 #include "qemu/error-report.h"
+#include "qapi/error.h"
 #include "qemu/cutils.h"
 #include "trace/control.h"
 
@@ -102,7 +103,7 @@ void qemu_log_needs_buffers(void)
  * substituted with the current PID. This is useful for debugging many
  * nested linux-user tasks but will result in lots of logs.
  */
-void qemu_set_log_filename(const char *filename)
+void qemu_set_log_filename(const char *filename, Error **errp)
 {
     char *pidstr;
     g_free(logfilename);
@@ -111,8 +112,8 @@ void qemu_set_log_filename(const char *filename)
     if (pidstr) {
         /* We only accept one %d, no other format strings */
         if (pidstr[1] != 'd' || strchr(pidstr + 2, '%')) {
-            error_report("Bad logfile format: %s", filename);
-            logfilename = NULL;
+            error_setg(errp, "Bad logfile format: %s", filename);
+            return;
         } else {
             logfilename = g_strdup_printf(filename, getpid());
         }
@@ -142,68 +143,75 @@ bool qemu_log_in_addr_range(uint64_t addr)
 }
 
 
-void qemu_set_dfilter_ranges(const char *filter_spec)
+void qemu_set_dfilter_ranges(const char *filter_spec, Error **errp)
 {
     gchar **ranges = g_strsplit(filter_spec, ",", 0);
-    if (ranges) {
-        gchar **next = ranges;
-        gchar *r = *next++;
-        debug_regions = g_array_sized_new(FALSE, FALSE,
-                                          sizeof(Range), g_strv_length(ranges));
-        while (r) {
-            char *range_op = strstr(r, "-");
-            char *r2 = range_op ? range_op + 1 : NULL;
-            if (!range_op) {
-                range_op = strstr(r, "+");
-                r2 = range_op ? range_op + 1 : NULL;
-            }
-            if (!range_op) {
-                range_op = strstr(r, "..");
-                r2 = range_op ? range_op + 2 : NULL;
-            }
-            if (range_op) {
-                const char *e = NULL;
-                uint64_t r1val, r2val;
+    int i;
 
-                if ((qemu_strtoull(r, &e, 0, &r1val) == 0) &&
-                    (qemu_strtoull(r2, NULL, 0, &r2val) == 0) &&
-                    r2val > 0) {
-                    struct Range range;
+    if (debug_regions) {
+        g_array_unref(debug_regions);
+        debug_regions = NULL;
+    }
 
-                    g_assert(e == range_op);
+    debug_regions = g_array_sized_new(FALSE, FALSE,
+                                      sizeof(Range), g_strv_length(ranges));
+    for (i = 0; ranges[i]; i++) {
+        const char *r = ranges[i];
+        const char *range_op, *r2, *e;
+        uint64_t r1val, r2val;
+        struct Range range;
 
-                    switch (*range_op) {
-                    case '+':
-                    {
-                        range.begin = r1val;
-                        range.end = r1val + (r2val - 1);
-                        break;
-                    }
-                    case '-':
-                    {
-                        range.end = r1val;
-                        range.begin = r1val - (r2val - 1);
-                        break;
-                    }
-                    case '.':
-                        range.begin = r1val;
-                        range.end = r2val;
-                        break;
-                    default:
-                        g_assert_not_reached();
-                    }
-                    g_array_append_val(debug_regions, range);
+        range_op = strstr(r, "-");
+        r2 = range_op ? range_op + 1 : NULL;
+        if (!range_op) {
+            range_op = strstr(r, "+");
+            r2 = range_op ? range_op + 1 : NULL;
+        }
+        if (!range_op) {
+            range_op = strstr(r, "..");
+            r2 = range_op ? range_op + 2 : NULL;
+        }
+        if (!range_op) {
+            error_setg(errp, "Bad range specifier");
+            goto out;
+        }
 
-                } else {
-                    g_error("Failed to parse range in: %s", r);
-                }
-            } else {
-                g_error("Bad range specifier in: %s", r);
-            }
-            r = *next++;
+        if (qemu_strtoull(r, &e, 0, &r1val)
+            || e != range_op) {
+            error_setg(errp, "Invalid number to the left of %.*s",
+                       (int)(r2 - range_op), range_op);
+            goto out;
+        }
+        if (qemu_strtoull(r2, NULL, 0, &r2val)) {
+            error_setg(errp, "Invalid number to the right of %.*s",
+                       (int)(r2 - range_op), range_op);
+            goto out;
+        }
+        if (r2val == 0) {
+            error_setg(errp, "Invalid range");
+            goto out;
+        }
+
+        switch (*range_op) {
+        case '+':
+            range.begin = r1val;
+            range.end = r1val + (r2val - 1);
+            break;
+        case '-':
+            range.end = r1val;
+            range.begin = r1val - (r2val - 1);
+            break;
+        case '.':
+            range.begin = r1val;
+            range.end = r2val;
+            break;
+        default:
+            g_assert_not_reached();
         }
-        g_strfreev(ranges);
+        g_array_append_val(debug_regions, range);
     }
+out:
+    g_strfreev(ranges);
 }
 
 /* fflush() the log file */
diff --git a/util/module.c b/util/module.c
index ce058ae..86e3f7a 100644
--- a/util/module.c
+++ b/util/module.c
@@ -55,13 +55,9 @@ static void init_lists(void)
 
 static ModuleTypeList *find_type(module_init_type type)
 {
-    ModuleTypeList *l;
-
     init_lists();
 
-    l = &init_type_list[type];
-
-    return l;
+    return &init_type_list[type];
 }
 
 void register_module_init(void (*fn)(void), module_init_type type)
diff --git a/vl.c b/vl.c
index 2f63eb4..c85833a 100644
--- a/vl.c
+++ b/vl.c
@@ -2352,10 +2352,7 @@ static int chardev_init_func(void *opaque, QemuOpts *opts, Error **errp)
 #ifdef CONFIG_VIRTFS
 static int fsdev_init_func(void *opaque, QemuOpts *opts, Error **errp)
 {
-    int ret;
-    ret = qemu_fsdev_add(opts);
-
-    return ret;
+    return qemu_fsdev_add(opts);
 }
 #endif
 
@@ -3068,7 +3065,7 @@ int main(int argc, char **argv, char **envp)
 
             popt = lookup_opt(argc, argv, &optarg, &optind);
             if (!(popt->arch_mask & arch_type)) {
-                printf("Option %s not supported for this target\n", popt->name);
+                error_report("Option not supported for this target");
                 exit(1);
             }
             switch(popt->index) {
@@ -3342,7 +3339,7 @@ int main(int argc, char **argv, char **envp)
                 log_file = optarg;
                 break;
             case QEMU_OPTION_DFILTER:
-                qemu_set_dfilter_ranges(optarg);
+                qemu_set_dfilter_ranges(optarg, &error_fatal);
                 break;
             case QEMU_OPTION_s:
                 add_device_config(DEV_GDB, "tcp::" DEFAULT_GDBSTUB_PORT);
@@ -3846,21 +3843,21 @@ int main(int argc, char **argv, char **envp)
                 break;
             case QEMU_OPTION_xen_domid:
                 if (!(xen_available())) {
-                    printf("Option %s not supported for this target\n", popt->name);
+                    error_report("Option not supported for this target");
                     exit(1);
                 }
                 xen_domid = atoi(optarg);
                 break;
             case QEMU_OPTION_xen_create:
                 if (!(xen_available())) {
-                    printf("Option %s not supported for this target\n", popt->name);
+                    error_report("Option not supported for this target");
                     exit(1);
                 }
                 xen_mode = XEN_CREATE;
                 break;
             case QEMU_OPTION_xen_attach:
                 if (!(xen_available())) {
-                    printf("Option %s not supported for this target\n", popt->name);
+                    error_report("Option not supported for this target");
                     exit(1);
                 }
                 xen_mode = XEN_ATTACH;
@@ -4057,7 +4054,7 @@ int main(int argc, char **argv, char **envp)
     /* Open the logfile at this point and set the log mask if necessary.
      */
     if (log_file) {
-        qemu_set_log_filename(log_file);
+        qemu_set_log_filename(log_file, &error_fatal);
     }
 
     if (log_mask) {