usb: Improve -usbdevice error reporting a bit

Most LegacyUSBFactory usbdevice_init() methods realize with
qdev_init_nofail(), even though their caller usbdevice_create() can
handle failure.  Okay if it really can't fail (I didn't check), but
somewhat brittle.

usb_msd_init() and usb_bt_init() call qdev_init().  The latter
additionally reports an error when qdev_init() fails.

Realization failure produces multiple error reports: a specific one
from qdev_init(), and generic ones from usb_bt_init(),
usb_create_simple(), usbdevice_create() and usb_parse().

Remove realization from the usbdevice_init() methods.  Realize in
usbdevice_create(), and produce exactly one error message there.  You
still get another one from usb_parse().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/usb/bus.c

@@ -651,10 +651,12 @@ USBDevice *usbdevice_create(const char *cmdline)
 {
     USBBus *bus = usb_bus_find(-1 /* any */);
     LegacyUSBFactory *f = NULL;
+    Error *err = NULL;
     GSList *i;
     char driver[32];
     const char *params;
     int len;
+    USBDevice *dev;
 
     params = strchr(cmdline,':');
     if (params) {
@@ -689,14 +691,28 @@ USBDevice *usbdevice_create(const char *cmdline)
         return NULL;
     }
 
-    if (!f->usbdevice_init) {
+    if (f->usbdevice_init) {
+        dev = f->usbdevice_init(bus, params);
+    } else {
         if (*params) {
             error_report("usbdevice %s accepts no params", driver);
             return NULL;
         }
-        return usb_create_simple(bus, f->name);
+        dev = usb_create(bus, f->name);
     }
-    return f->usbdevice_init(bus, params);
+    if (!dev) {
+        error_report("Failed to create USB device '%s'", f->name);
+        return NULL;
+    }
+    object_property_set_bool(OBJECT(dev), true, "realized", &err);
+    if (err) {
+        error_report("Failed to initialize USB device '%s': %s",
+                     f->name, error_get_pretty(err));
+        error_free(err);
+        object_unparent(OBJECT(dev));
+        return NULL;
+    }
+    return dev;
 }
 
 static void usb_device_class_init(ObjectClass *klass, void *data)

hw/usb/dev-bluetooth.c

@@ -536,11 +536,6 @@ static USBDevice *usb_bt_init(USBBus *bus, const char *cmdline)
     dev = usb_create(bus, name);
     s = DO_UPCAST(struct USBBtState, dev, dev);
     s->hci = hci;
-    if (qdev_init(&dev->qdev) < 0) {
-        error_report("Failed to initialize USB device '%s'", name);
-        return NULL;
-    }
-
     return dev;
 }
 

hw/usb/dev-network.c

@@ -1406,7 +1406,6 @@ static USBDevice *usb_net_init(USBBus *bus, const char *cmdline)
 
     dev = usb_create(bus, "usb-net");
     qdev_set_nic_properties(&dev->qdev, &nd_table[idx]);
-    qdev_init_nofail(&dev->qdev);
     return dev;
 }
 

hw/usb/dev-serial.c

@@ -549,8 +549,6 @@ static USBDevice *usb_serial_init(USBBus *bus, const char *filename)
         qdev_prop_set_uint16(&dev->qdev, "vendorid", vendorid);
     if (productid)
         qdev_prop_set_uint16(&dev->qdev, "productid", productid);
-    qdev_init_nofail(&dev->qdev);
-
     return dev;
 }
 
@@ -565,8 +563,6 @@ static USBDevice *usb_braille_init(USBBus *bus, const char *unused)
 
     dev = usb_create(bus, "usb-braille");
     qdev_prop_set_chr(&dev->qdev, "chardev", cdrv);
-    qdev_init_nofail(&dev->qdev);
-
     return dev;
 }
 

hw/usb/dev-storage.c

@@ -711,9 +711,6 @@ static USBDevice *usb_msd_init(USBBus *bus, const char *filename)
         object_unparent(OBJECT(dev));
         return NULL;
     }
-    if (qdev_init(&dev->qdev) < 0)
-        return NULL;
-
     return dev;
 }
 

hw/usb/host-legacy.c

@@ -128,7 +128,6 @@ USBDevice *usb_host_device_open(USBBus *bus, const char *devname)
     qdev_prop_set_uint32(&dev->qdev, "hostaddr",  filter.addr);
     qdev_prop_set_uint32(&dev->qdev, "vendorid",  filter.vendor_id);
     qdev_prop_set_uint32(&dev->qdev, "productid", filter.product_id);
-    qdev_init_nofail(&dev->qdev);
     return dev;
 
 fail: