virtio: release virtio index when fail to device_register

index can be reused by other virtio device.

Cc: stable@vger.kernel.org
Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 48230a5e12f262b67d28d87adc713f462e8ec5fc..bf7ff3934d7fff5169e5252cd8fc0a29ea25a133 100644 (file)
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -333,6 +333,8 @@ int register_virtio_device(struct virtio_device *dev)
        /* device_register() causes the bus infrastructure to look for a
         * matching driver. */
        err = device_register(&dev->dev);
+       if (err)
+               ida_simple_remove(&virtio_index_ida, dev->index);
 out:
        if (err)
                virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED);