lockable: replaced locks with lock guard macros where appropriate

- ran regexp "qemu_mutex_lock\(.*\).*\n.*if" to find targets
- replaced result with QEMU_LOCK_GUARD if all unlocks at function end
- replaced result with WITH_QEMU_LOCK_GUARD if unlock not at end

Signed-off-by: Daniel Brodsky <dnbrdsky@gmail.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-id: 20200404042108.389635-3-dnbrdsky@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

5 files changed, 16 insertions, 21 deletions

diff --git a/util/log.c b/util/log.c
index 2da6cb3..bdb3d71 100644
--- a/util/log.c
+++ b/util/log.c
@@ -25,6 +25,7 @@
 #include "qemu/cutils.h"
 #include "trace/control.h"
 #include "qemu/thread.h"
+#include "qemu/lockable.h"
 
 static char *logfilename;
 static QemuMutex qemu_logfile_mutex;
@@ -94,7 +95,7 @@ void qemu_set_log(int log_flags)
     if (qemu_loglevel && (!is_daemonized() || logfilename)) {
         need_to_open_file = true;
     }
-    qemu_mutex_lock(&qemu_logfile_mutex);
+    QEMU_LOCK_GUARD(&qemu_logfile_mutex);
     if (qemu_logfile && !need_to_open_file) {
         logfile = qemu_logfile;
         atomic_rcu_set(&qemu_logfile, NULL);
@@ -136,7 +137,6 @@ void qemu_set_log(int log_flags)
         }
         atomic_rcu_set(&qemu_logfile, logfile);
     }
-    qemu_mutex_unlock(&qemu_logfile_mutex);
 }
 
 void qemu_log_needs_buffers(void)
diff --git a/util/qemu-timer.c b/util/qemu-timer.c
index d548d3c..b6575a2 100644
--- a/util/qemu-timer.c
+++ b/util/qemu-timer.c
@@ -459,17 +459,16 @@ void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t expire_time)
     QEMUTimerList *timer_list = ts->timer_list;
     bool rearm;
 
-    qemu_mutex_lock(&timer_list->active_timers_lock);
-    if (ts->expire_time == -1 || ts->expire_time > expire_time) {
-        if (ts->expire_time != -1) {
-            timer_del_locked(timer_list, ts);
+    WITH_QEMU_LOCK_GUARD(&timer_list->active_timers_lock) {
+        if (ts->expire_time == -1 || ts->expire_time > expire_time) {
+            if (ts->expire_time != -1) {
+                timer_del_locked(timer_list, ts);
+            }
+            rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
+        } else {
+            rearm = false;
         }
-        rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
-    } else {
-        rearm = false;
     }
-    qemu_mutex_unlock(&timer_list->active_timers_lock);
-
     if (rearm) {
         timerlist_rearm(timer_list);
     }
diff --git a/util/rcu.c b/util/rcu.c
index 177a675..60a37f7 100644
--- a/util/rcu.c
+++ b/util/rcu.c
@@ -31,6 +31,7 @@
 #include "qemu/atomic.h"
 #include "qemu/thread.h"
 #include "qemu/main-loop.h"
+#include "qemu/lockable.h"
 #if defined(CONFIG_MALLOC_TRIM)
 #include <malloc.h>
 #endif
@@ -141,14 +142,14 @@ static void wait_for_readers(void)
 
 void synchronize_rcu(void)
 {
-    qemu_mutex_lock(&rcu_sync_lock);
+    QEMU_LOCK_GUARD(&rcu_sync_lock);
 
     /* Write RCU-protected pointers before reading p_rcu_reader->ctr.
      * Pairs with smp_mb_placeholder() in rcu_read_lock().
      */
     smp_mb_global();
 
-    qemu_mutex_lock(&rcu_registry_lock);
+    QEMU_LOCK_GUARD(&rcu_registry_lock);
     if (!QLIST_EMPTY(&registry)) {
         /* In either case, the atomic_mb_set below blocks stores that free
          * old RCU-protected pointers.
@@ -169,9 +170,6 @@ void synchronize_rcu(void)
 
         wait_for_readers();
     }
-
-    qemu_mutex_unlock(&rcu_registry_lock);
-    qemu_mutex_unlock(&rcu_sync_lock);
 }
 
 
diff --git a/util/thread-pool.c b/util/thread-pool.c
index 4ed9b89..d763cea 100644
--- a/util/thread-pool.c
+++ b/util/thread-pool.c
@@ -210,7 +210,7 @@ static void thread_pool_cancel(BlockAIOCB *acb)
 
     trace_thread_pool_cancel(elem, elem->common.opaque);
 
-    qemu_mutex_lock(&pool->lock);
+    QEMU_LOCK_GUARD(&pool->lock);
     if (elem->state == THREAD_QUEUED &&
         /* No thread has yet started working on elem. we can try to "steal"
          * the item from the worker if we can get a signal from the
@@ -225,7 +225,6 @@ static void thread_pool_cancel(BlockAIOCB *acb)
         elem->ret = -ECANCELED;
     }
 
-    qemu_mutex_unlock(&pool->lock);
 }
 
 static AioContext *thread_pool_get_aio_context(BlockAIOCB *acb)
diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c
index ddd9a96..e399e33 100644
--- a/util/vfio-helpers.c
+++ b/util/vfio-helpers.c
@@ -21,6 +21,7 @@
 #include "standard-headers/linux/pci_regs.h"
 #include "qemu/event_notifier.h"
 #include "qemu/vfio-helpers.h"
+#include "qemu/lockable.h"
 #include "trace.h"
 
 #define QEMU_VFIO_DEBUG 0
@@ -667,14 +668,12 @@ int qemu_vfio_dma_reset_temporary(QEMUVFIOState *s)
         .size = QEMU_VFIO_IOVA_MAX - s->high_water_mark,
     };
     trace_qemu_vfio_dma_reset_temporary(s);
-    qemu_mutex_lock(&s->lock);
+    QEMU_LOCK_GUARD(&s->lock);
     if (ioctl(s->container, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
         error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
-        qemu_mutex_unlock(&s->lock);
         return -errno;
     }
     s->high_water_mark = QEMU_VFIO_IOVA_MAX;
-    qemu_mutex_unlock(&s->lock);
     return 0;
 }