diff options
| author | Chris Leech <cleech@redhat.com> | 2023-03-10 04:09:13 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-03-15 04:20:55 +0300 |
| commit | 00e885efcfbb8712d3e1bfc1ae30639c15ca1d3b (patch) | |
| tree | 92eb3e277ed07c27d06e2d06b9b61523935cb87d /block | |
| parent | 9b0cb770f5d7b1ff40bea7ca385438ee94570eec (diff) | |
| download | linux-00e885efcfbb8712d3e1bfc1ae30639c15ca1d3b.tar.xz | |
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 <mpatalan@redhat.com>
Signed-off-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230310010913.1014789-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.h | 5 |
1 files changed, 3 insertions, 2 deletions
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); \ |