On Mon, 15 Aug 2022 10:00:41 -0700, Bart Van Assche wrote:

The only block driver for which the .map_queues() callback can fail is
null_blk. Since most blk_mq_map_queues() callers ignore the return value of
this function, modify the null_blk driver such that its .map_queues()
callback does not fail and change the blk_mq_map_queues() return type into
void.

Please consider this patch series for the next merge window.

[...]

Applied, thanks!

[1/2] null_blk: Modify the behavior of null_map_queues()
      commit: 69aa11ae74b809d4539ae587d1ebc1c90592051e
[2/2] block: Change the return type of blk_mq_map_queues() into void
      commit: f19f2c966b2fdead8b1ca10a93fa8a6eda2a456d

Best regards,
-- 
Jens Axboe