On Fri, Oct 24, 2014 at 12:12 AM, Michael S. Tsirkin <mst@xxxxxxxxxx> wrote:
> 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.
Yes, there is a tiny race window.
>
> To fix, cleanup in reverse order of initialization.
Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> ---
> drivers/block/virtio_blk.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index 56aadbc..adfba9f 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -883,8 +883,8 @@ 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);
Thanks,
--
Ming Lei
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