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virtio_blk: fix race at module removal

Browse source 
If a device appears while module is being removed,
driver will get a callback after we've given up
on the major number.

In theory this means this major number can get reused
by something else, resulting in a conflict.

To fix, cleanup in reverse order of initialization.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Michael S. Tsirkin 2014-11-10 09:34:29 +10:30 • committed by Rusty Russell
commit 46652a861b
1 changed files with 1 additions and 1 deletions
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2
drivers/block/virtio_blk.c
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@ -871,8 +871,8 @@ out_destroy_workqueue:
static void __exit fini(void)
{
unregister_blkdev(major, "virtblk");
unregister_virtio_driver(&virtio_blk);
unregister_blkdev(major, "virtblk");
destroy_workqueue(virtblk_wq);
}
module_init(init);