Commit 08c875cb authored by Daniel Wagner's avatar Daniel Wagner Committed by Jens Axboe

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 705cda97 ("blk-mq: Make it
safe to use RCU to iterate over blk_mq_tag_set.tag_list") and
05b79413 ("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: 97889f9a ("blk-mq: remove synchronize_rcu() from blk_mq_del_queue_tag_set()"
Signed-off-by: default avatarDaniel Wagner <dwagner@suse.de>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent ef45fe47
...@@ -2899,7 +2899,7 @@ static void blk_mq_del_queue_tag_set(struct request_queue *q) ...@@ -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; struct blk_mq_tag_set *set = q->tag_set;
mutex_lock(&set->tag_list_lock); 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)) { if (list_is_singular(&set->tag_list)) {
/* just transitioned to unshared */ /* just transitioned to unshared */
set->flags &= ~BLK_MQ_F_TAG_SHARED; 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, ...@@ -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) if (set->flags & BLK_MQ_F_TAG_SHARED)
queue_set_hctx_shared(q, true); 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); mutex_unlock(&set->tag_list_lock);
} }
......
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