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blk-mq: bitmap tag: fix races on shared ::wake_index fields

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Fix racy updates of shared blk_mq_bitmap_tags::wake_index
and blk_mq_hw_ctx::wake_index fields.

Cc: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Alexander Gordeev 2014-06-17 22:12:35 -07:00 • committed by Jens Axboe
commit 8537b12034
3 changed files with 23 additions and 13 deletions
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2
include/linux/blk-mq.h
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@ -42,7 +42,7 @@ struct blk_mq_hw_ctx {
unsigned int nr_ctx;
struct blk_mq_ctx **ctxs;
unsigned int wait_index;
atomic_t wait_index;
struct blk_mq_tags *tags;