block: simplify calling convention of elv_unregister_queue()

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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 <ebiggers@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220124215938.2769-2-ebiggers@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Eric Biggers 2022-01-24 13:59:36 -08:00 • committed by Jens Axboe

parent 483546c11d

commit f5ec592dd3

2 changed files with 5 additions and 6 deletions

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3

block/blk-sysfs.c

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8

block/elevator.c

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