From: Chris Leech Date: Fri, 10 Mar 2023 01:09:13 +0000 (+0800) Subject: blk-mq: fix "bad unlock balance detected" on q->srcu in __blk_mq_run_dispatch_ops X-Git-Tag: v6.6.7~3095^2~20 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=00e885efcfbb8712d3e1bfc1ae30639c15ca1d3b;p=platform%2Fkernel%2Flinux-starfive.git blk-mq: fix "bad unlock balance detected" on q->srcu in __blk_mq_run_dispatch_ops The 'q' parameter of the macro __blk_mq_run_dispatch_ops may not be one local variable, such as, it is rq->q, then request queue pointed by this variable could be changed to another queue in case of BLK_MQ_F_TAG_QUEUE_SHARED after 'dispatch_ops' returns, then 'bad unlock balance' is triggered. Fixes the issue by adding one local variable for doing srcu lock/unlock. Fixes: 2a904d00855f ("blk-mq: remove hctx_lock and hctx_unlock") Cc: Marco Patalano Signed-off-by: Chris Leech Signed-off-by: Ming Lei Link: https://lore.kernel.org/r/20230310010913.1014789-1-ming.lei@redhat.com Signed-off-by: Jens Axboe --- diff --git a/block/blk-mq.h b/block/blk-mq.h index ef59fee62780..a7482d2cc82e 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -378,12 +378,13 @@ static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx, #define __blk_mq_run_dispatch_ops(q, check_sleep, dispatch_ops) \ do { \ if ((q)->tag_set->flags & BLK_MQ_F_BLOCKING) { \ + struct blk_mq_tag_set *__tag_set = (q)->tag_set; \ int srcu_idx; \ \ might_sleep_if(check_sleep); \ - srcu_idx = srcu_read_lock((q)->tag_set->srcu); \ + srcu_idx = srcu_read_lock(__tag_set->srcu); \ (dispatch_ops); \ - srcu_read_unlock((q)->tag_set->srcu, srcu_idx); \ + srcu_read_unlock(__tag_set->srcu, srcu_idx); \ } else { \ rcu_read_lock(); \ (dispatch_ops); \