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| author |  Ming Lei <ming.lei@redhat.com>
| 2021-11-11 16:51:33 +0800 |
|---|---|---|
| committer |  Jens Axboe <axboe@kernel.dk>
| 2021-11-11 11:52:33 -0700 |
| commit | 10f7335e3627b4efa341ef8ac457f2c0770c5c19 (patch) | |
| tree | 0f53e8e80279c25b7992bae4d94d93004fa15980 /block/blk-mq.c | |
| parent | block: fix kerneldoc for disk_register_independent_access__ranges() (diff) | |
| download | linux-10f7335e3627b4efa341ef8ac457f2c0770c5c19.tar.gz linux-10f7335e3627b4efa341ef8ac457f2c0770c5c19.tar.bz2 linux-10f7335e3627b4efa341ef8ac457f2c0770c5c19.zip | |
blk-mq: don't grab ->q_usage_counter in blk_mq_sched_bio_merge
blk_mq_sched_bio_merge is only called from blk-mq.c:blk_attempt_bio_merge(),
which is called when queue usage counter is grabbed already:
1) blk_mq_get_new_requests()
2) blk_mq_get_request()
- cached request in current plug owns one queue usage counter
So don't grab ->q_usage_counter in blk_mq_sched_bio_merge(), and more
importantly this nest way causes hang in blk_mq_freeze_queue_wait().
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211111085134.345235-2-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.c')
0 files changed, 0 insertions, 0 deletions