On Mon, Jan 24, 2022 at 01:59:36PM -0800, Eric Biggers wrote:

From: Eric Biggers <redacted>

Make elv_unregister_queue() a no-op if q->elevator is NULL or is not
registered.

This simplifies the existing callers, as well as the future caller in
the error path of blk_register_queue().

Also don't bother checking whether q is NULL, since it never is.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Eric Biggers <redacted>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>