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blk-cgroup: defer blkcg css_put until blkg is unlinked from queue #844

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blk-cgroup: defer blkcg css_put until blkg is unlinked from queue #844

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7 changes: 5 additions & 2 deletions block/blk-cgroup.c
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Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,11 @@ static void blkg_free_workfn(struct work_struct *work)
spin_lock_irq(&q->queue_lock);
list_del_init(&blkg->q_node);
spin_unlock_irq(&q->queue_lock);
/*
* Release blkcg css ref only after blkg is removed from q->blkg_list,
* so concurrent iterators won't see a blkg with a freed blkcg.
*/
css_put(&blkg->blkcg->css);
mutex_unlock(&q->blkcg_mutex);

blk_put_queue(q);
Expand Down Expand Up @@ -179,8 +184,6 @@ static void __blkg_release(struct rcu_head *rcu)
for_each_possible_cpu(cpu)
__blkcg_rstat_flush(blkcg, cpu);

/* release the blkcg and parent blkg refs this blkg has been holding */
css_put(&blkg->blkcg->css);
blkg_free(blkg);
}

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