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| author | Daniel Wagner <dwagner@suse.de> | 2020-07-28 15:29:51 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-07-28 09:37:09 -0600 |
| commit | 08c875cbf481d74db82d6bba2fbcf580087dee24 (patch) | |
| tree | 8ed4f010c4352c514d3deff6462b8d7a2423d587 /block | |
| parent | ef45fe470e1e5410db4af87abc5d5055427945ac (diff) | |
| download | lwn-08c875cbf481d74db82d6bba2fbcf580087dee24.tar.gz lwn-08c875cbf481d74db82d6bba2fbcf580087dee24.zip | |
block: Use non _rcu version of list functions for tag_set_list
tag_set_list is only accessed under the tag_set_lock lock. There is
no need for using the _rcu list functions.
The _rcu list function were introduced to allow read access to the
tag_set_list protected under RCU, see 705cda97ee3a ("blk-mq: Make it
safe to use RCU to iterate over blk_mq_tag_set.tag_list") and
05b79413946d ("Revert "blk-mq: don't handle TAG_SHARED in restart"").
Those changes got reverted later but the cleanup commit missed a
couple of places to undo the changes.
Fixes: 97889f9ac24f ("blk-mq: remove synchronize_rcu() from blk_mq_del_queue_tag_set()"
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index c3856377b961..c04e2452dd82 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2899,7 +2899,7 @@ static void blk_mq_del_queue_tag_set(struct request_queue *q) struct blk_mq_tag_set *set = q->tag_set; mutex_lock(&set->tag_list_lock); - list_del_rcu(&q->tag_set_list); + list_del(&q->tag_set_list); if (list_is_singular(&set->tag_list)) { /* just transitioned to unshared */ set->flags &= ~BLK_MQ_F_TAG_SHARED; @@ -2926,7 +2926,7 @@ static void blk_mq_add_queue_tag_set(struct blk_mq_tag_set *set, } if (set->flags & BLK_MQ_F_TAG_SHARED) queue_set_hctx_shared(q, true); - list_add_tail_rcu(&q->tag_set_list, &set->tag_list); + list_add_tail(&q->tag_set_list, &set->tag_list); mutex_unlock(&set->tag_list_lock); } |