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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>
This commit is contained in:
weiping zhang 2017-11-29 09:23:01 +08:00 committed by Michael S. Tsirkin
parent 23f1b8d938
commit e60ea67bb6
1 changed files with 2 additions and 0 deletions
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2
drivers/virtio/virtio.c
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@ -333,6 +333,8 @@ int register_virtio_device(struct virtio_device *dev)
/* device_register() causes the bus infrastructure to look for a /* device_register() causes the bus infrastructure to look for a
* matching driver. */ * matching driver. */
err = device_register(&dev->dev); err = device_register(&dev->dev);
if (err)
ida_simple_remove(&virtio_index_ida, dev->index);
out: out:
if (err) if (err)
virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED); virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED);