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null_blk: Modify the behavior of null_map_queues()

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Instead of returning -EINVAL if an internal inconsistency is detected,
fall back to a single submission queue. This patch prepares for changing
the return value of the .map_queues() callbacks into void.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Keith Busch <kbusch@kernel.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220815170043.19489-2-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2022-08-15 10:00:42 -07:00 committed by Jens Axboe
parent 74e237b6e7
commit 10b41ea15e
1 changed files with 3 additions and 1 deletions
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4
drivers/block/null_blk/main.c
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@ -1555,7 +1555,9 @@ static int null_map_queues(struct blk_mq_tag_set *set)
} else {
pr_warn("tag set has unexpected nr_hw_queues: %d\n",
set->nr_hw_queues);
return -EINVAL;
WARN_ON_ONCE(true);
submit_queues = 1;
poll_queues = 0;
}
}