[PATCH 4.9 010/148] virtio: release virtio index when fail to device_register

Greg Kroah-Hartman
2017-12-12T12:55:06Z

From: weiping zhang <zwp10758@gmail.com>

commit e60ea67bb60459b95a50a156296041a13e0e380e upstream.

index can be reused by other virtio device.

Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/virtio/virtio.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -323,6 +323,8 @@ int register_virtio_device(struct virtio
/* 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)
add_status(dev, VIRTIO_CONFIG_S_FAILED);