usb-bus: convert USBDeviceClass init to realize

Add "realize/unrealize" in USBDeviceClass, which has errp
as a parameter. So all the implementations now use
error_setg instead of error_report for reporting error.

Note: this patch still keep "init" in USBDeviceClass, and
call kclass->init in usb_device_realize(), avoid breaking
git bisect. After realize all usb devices, will be removed.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

6 files changed, 81 insertions, 50 deletions

diff --git a/hw/usb/bus.c b/hw/usb/bus.c
index c7c4dad..12881cb 100644
--- a/hw/usb/bus.c
+++ b/hw/usb/bus.c
@@ -9,7 +9,7 @@ static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
 
 static char *usb_get_dev_path(DeviceState *dev);
 static char *usb_get_fw_dev_path(DeviceState *qdev);
-static int usb_qdev_exit(DeviceState *qdev);
+static void usb_qdev_unrealize(DeviceState *qdev, Error **errp);
 
 static Property usb_props[] = {
     DEFINE_PROP_STRING("port", USBDevice, port_path),
@@ -107,13 +107,15 @@ USBBus *usb_bus_find(int busnr)
     return NULL;
 }
 
-static int usb_device_init(USBDevice *dev)
+static void usb_device_realize(USBDevice *dev, Error **errp)
 {
     USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
-    if (klass->init) {
-        return klass->init(dev);
+
+    if (klass->realize) {
+        klass->realize(dev, errp);
+    } else if (klass->init) {
+        klass->init(dev);
     }
-    return 0;
 }
 
 USBDevice *usb_device_find_device(USBDevice *dev, uint8_t addr)
@@ -232,36 +234,41 @@ void usb_device_free_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps)
     }
 }
 
-static int usb_qdev_init(DeviceState *qdev)
+static void usb_qdev_realize(DeviceState *qdev, Error **errp)
 {
     USBDevice *dev = USB_DEVICE(qdev);
-    int rc;
+    Error *local_err = NULL;
 
     pstrcpy(dev->product_desc, sizeof(dev->product_desc),
             usb_device_get_product_desc(dev));
     dev->auto_attach = 1;
     QLIST_INIT(&dev->strings);
     usb_ep_init(dev);
-    rc = usb_claim_port(dev);
-    if (rc != 0) {
-        return rc;
+
+    usb_claim_port(dev, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
     }
-    rc = usb_device_init(dev);
-    if (rc != 0) {
+
+    usb_device_realize(dev, &local_err);
+    if (local_err) {
         usb_release_port(dev);
-        return rc;
+        error_propagate(errp, local_err);
+        return;
     }
+
     if (dev->auto_attach) {
-        rc = usb_device_attach(dev);
-        if (rc != 0) {
-            usb_qdev_exit(qdev);
-            return rc;
+        usb_device_attach(dev, &local_err);
+        if (local_err) {
+            usb_qdev_unrealize(qdev, NULL);
+            error_propagate(errp, local_err);
+            return;
         }
     }
-    return 0;
 }
 
-static int usb_qdev_exit(DeviceState *qdev)
+static void usb_qdev_unrealize(DeviceState *qdev, Error **errp)
 {
     USBDevice *dev = USB_DEVICE(qdev);
 
@@ -272,7 +279,6 @@ static int usb_qdev_exit(DeviceState *qdev)
     if (dev->port) {
         usb_release_port(dev);
     }
-    return 0;
 }
 
 typedef struct LegacyUSBFactory
@@ -392,7 +398,7 @@ void usb_unregister_port(USBBus *bus, USBPort *port)
     bus->nfree--;
 }
 
-int usb_claim_port(USBDevice *dev)
+void usb_claim_port(USBDevice *dev, Error **errp)
 {
     USBBus *bus = usb_bus_from_device(dev);
     USBPort *port;
@@ -406,9 +412,9 @@ int usb_claim_port(USBDevice *dev)
             }
         }
         if (port == NULL) {
-            error_report("Error: usb port %s (bus %s) not found (in use?)",
-                         dev->port_path, bus->qbus.name);
-            return -1;
+            error_setg(errp, "Error: usb port %s (bus %s) not found (in use?)",
+                       dev->port_path, bus->qbus.name);
+            return;
         }
     } else {
         if (bus->nfree == 1 && strcmp(object_get_typename(OBJECT(dev)), "usb-hub") != 0) {
@@ -416,9 +422,9 @@ int usb_claim_port(USBDevice *dev)
             usb_create_simple(bus, "usb-hub");
         }
         if (bus->nfree == 0) {
-            error_report("Error: tried to attach usb device %s to a bus "
-                         "with no free ports", dev->product_desc);
-            return -1;
+            error_setg(errp, "Error: tried to attach usb device %s to a bus "
+                       "with no free ports", dev->product_desc);
+            return;
         }
         port = QTAILQ_FIRST(&bus->free);
     }
@@ -432,7 +438,6 @@ int usb_claim_port(USBDevice *dev)
 
     QTAILQ_INSERT_TAIL(&bus->used, port, next);
     bus->nused++;
-    return 0;
 }
 
 void usb_release_port(USBDevice *dev)
@@ -475,7 +480,7 @@ static void usb_mask_to_str(char *dest, size_t size,
     }
 }
 
-int usb_device_attach(USBDevice *dev)
+void usb_device_attach(USBDevice *dev, Error **errp)
 {
     USBBus *bus = usb_bus_from_device(dev);
     USBPort *port = dev->port;
@@ -489,18 +494,16 @@ int usb_device_attach(USBDevice *dev)
                           devspeed, portspeed);
 
     if (!(port->speedmask & dev->speedmask)) {
-        error_report("Warning: speed mismatch trying to attach"
-                     " usb device \"%s\" (%s speed)"
-                     " to bus \"%s\", port \"%s\" (%s speed)",
-                     dev->product_desc, devspeed,
-                     bus->qbus.name, port->path, portspeed);
-        return -1;
+        error_setg(errp, "Warning: speed mismatch trying to attach"
+                   " usb device \"%s\" (%s speed)"
+                   " to bus \"%s\", port \"%s\" (%s speed)",
+                   dev->product_desc, devspeed,
+                   bus->qbus.name, port->path, portspeed);
+        return;
     }
 
     dev->attached++;
     usb_attach(port);
-
-    return 0;
 }
 
 int usb_device_detach(USBDevice *dev)
@@ -688,9 +691,9 @@ static void usb_device_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *k = DEVICE_CLASS(klass);
     k->bus_type = TYPE_USB_BUS;
-    k->init     = usb_qdev_init;
     k->unplug   = qdev_simple_unplug_cb;
-    k->exit     = usb_qdev_exit;
+    k->realize  = usb_qdev_realize;
+    k->unrealize = usb_qdev_unrealize;
     k->props    = usb_props;
 }
 
diff --git a/hw/usb/dev-serial.c b/hw/usb/dev-serial.c
index d360614..eb1b115 100644
--- a/hw/usb/dev-serial.c
+++ b/hw/usb/dev-serial.c
@@ -9,7 +9,7 @@
  */
 
 #include "qemu-common.h"
-#include "qemu/error-report.h"
+#include "monitor/monitor.h"
 #include "hw/usb.h"
 #include "hw/usb/desc.h"
 #include "sysemu/char.h"
@@ -451,6 +451,7 @@ static void usb_serial_read(void *opaque, const uint8_t *buf, int size)
 static void usb_serial_event(void *opaque, int event)
 {
     USBSerialState *s = opaque;
+    Error *local_err = NULL;
 
     switch (event) {
         case CHR_EVENT_BREAK:
@@ -460,7 +461,11 @@ static void usb_serial_event(void *opaque, int event)
             break;
         case CHR_EVENT_OPENED:
             if (!s->dev.attached) {
-                usb_device_attach(&s->dev);
+                usb_device_attach(&s->dev, &local_err);
+                if (local_err) {
+                    qerror_report_err(local_err);
+                    error_free(local_err);
+                }
             }
             break;
         case CHR_EVENT_CLOSED:
@@ -474,6 +479,7 @@ static void usb_serial_event(void *opaque, int event)
 static int usb_serial_initfn(USBDevice *dev)
 {
     USBSerialState *s = DO_UPCAST(USBSerialState, dev, dev);
+    Error *local_err = NULL;
 
     usb_desc_create_serial(dev);
     usb_desc_init(dev);
@@ -489,7 +495,11 @@ static int usb_serial_initfn(USBDevice *dev)
     usb_serial_handle_reset(dev);
 
     if (s->cs->be_open && !dev->attached) {
-        usb_device_attach(dev);
+        usb_device_attach(dev, &local_err);
+        if (local_err) {
+            qerror_report_err(local_err);
+            error_free(local_err);
+        }
     }
     return 0;
 }
diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c
index 55ef684..9cd405c 100644
--- a/hw/usb/dev-storage.c
+++ b/hw/usb/dev-storage.c
@@ -549,12 +549,17 @@ static void usb_msd_handle_data(USBDevice *dev, USBPacket *p)
 static void usb_msd_password_cb(void *opaque, int err)
 {
     MSDState *s = opaque;
+    Error *local_err = NULL;
 
-    if (!err)
-        err = usb_device_attach(&s->dev);
+    if (!err) {
+        usb_device_attach(&s->dev, &local_err);
+    }
 
-    if (err)
+    if (local_err) {
+        qerror_report_err(local_err);
+        error_free(local_err);
         qdev_unplug(&s->dev.qdev, NULL);
+    }
 }
 
 static void *usb_msd_load_request(QEMUFile *f, SCSIRequest *req)
diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
index c189147..9f92705 100644
--- a/hw/usb/host-libusb.c
+++ b/hw/usb/host-libusb.c
@@ -834,6 +834,7 @@ static int usb_host_open(USBHostDevice *s, libusb_device *dev)
     int bus_num = libusb_get_bus_number(dev);
     int addr    = libusb_get_device_address(dev);
     int rc;
+    Error *local_err = NULL;
 
     trace_usb_host_open_started(bus_num, addr);
 
@@ -869,8 +870,10 @@ static int usb_host_open(USBHostDevice *s, libusb_device *dev)
                  "host:%d.%d", bus_num, addr);
     }
 
-    rc = usb_device_attach(udev);
-    if (rc) {
+    usb_device_attach(udev, &local_err);
+    if (local_err) {
+        error_report("%s", error_get_pretty(local_err));
+        error_free(local_err);
         goto fail;
     }
 
diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
index 44522d9..95158b3 100644
--- a/hw/usb/redirect.c
+++ b/hw/usb/redirect.c
@@ -1256,6 +1256,7 @@ static void usbredir_device_reject_bh(void *opaque)
 static void usbredir_do_attach(void *opaque)
 {
     USBRedirDevice *dev = opaque;
+    Error *local_err = NULL;
 
     /* In order to work properly with XHCI controllers we need these caps */
     if ((dev->dev.port->speedmask & USB_SPEED_MASK_SUPER) && !(
@@ -1270,7 +1271,10 @@ static void usbredir_do_attach(void *opaque)
         return;
     }
 
-    if (usb_device_attach(&dev->dev) != 0) {
+    usb_device_attach(&dev->dev, &local_err);
+    if (local_err) {
+        error_report("%s", error_get_pretty(local_err));
+        error_free(local_err);
         WARNING("rejecting device due to speed mismatch\n");
         usbredir_reject_device(dev);
     }
diff --git a/include/hw/usb.h b/include/hw/usb.h
index 6b32a3b..612f09f 100644
--- a/include/hw/usb.h
+++ b/include/hw/usb.h
@@ -267,11 +267,17 @@ struct USBDevice {
 #define USB_DEVICE_GET_CLASS(obj) \
      OBJECT_GET_CLASS(USBDeviceClass, (obj), TYPE_USB_DEVICE)
 
+typedef void (*USBDeviceRealize)(USBDevice *dev, Error **errp);
+typedef void (*USBDeviceUnrealize)(USBDevice *dev, Error **errp);
+
 typedef struct USBDeviceClass {
     DeviceClass parent_class;
 
     int (*init)(USBDevice *dev);
 
+    USBDeviceRealize realize;
+    USBDeviceUnrealize unrealize;
+
     /*
      * Walk (enabled) downstream ports, check for a matching device.
      * Only hubs implement this.
@@ -544,9 +550,9 @@ int usb_register_companion(const char *masterbus, USBPort *ports[],
                            void *opaque, USBPortOps *ops, int speedmask);
 void usb_port_location(USBPort *downstream, USBPort *upstream, int portnr);
 void usb_unregister_port(USBBus *bus, USBPort *port);
-int usb_claim_port(USBDevice *dev);
+void usb_claim_port(USBDevice *dev, Error **errp);
 void usb_release_port(USBDevice *dev);
-int usb_device_attach(USBDevice *dev);
+void usb_device_attach(USBDevice *dev, Error **errp);
 int usb_device_detach(USBDevice *dev);
 int usb_device_delete_addr(int busnr, int addr);