path: root/block/elevator.c
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authorKeith Busch <>2018-09-25 10:36:20 -0600
committerJens Axboe <>2018-09-25 20:17:59 -0600
commit530ca2c9bd6949c72c9b5cfc330cb3dbccaa3f5b (patch)
treef25bd9aa92fc0042974192d81b705253ddd8c597 /block/elevator.c
parentb57e99b4b8b0ebdf9707424e7ddc0c392bdc5fe6 (diff)
blk-mq: Allow blocking queue tag iter callbacks
A recent commit runs tag iterator callbacks under the rcu read lock, but existing callbacks do not satisfy the non-blocking requirement. The commit intended to prevent an iterator from accessing a queue that's being modified. This patch fixes the original issue by taking a queue reference instead of reading it, which allows callbacks to make blocking calls. Fixes: f5bbbbe4d6357 ("blk-mq: sync the update nr_hw_queues with blk_mq_queue_tag_busy_iter") Acked-by: Jianchao Wang <> Signed-off-by: Keith Busch <> Signed-off-by: Jens Axboe <>
Diffstat (limited to 'block/elevator.c')
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