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blk-cgroup: Remove unnecessary rcu_read_lock/unlock()

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spin_lock_irq/spin_unlock_irq contains preempt_disable/enable().
Which can serve as RCU read-side critical region, so remove
rcu_read_lock/unlock().

Signed-off-by: Fanjun Kong <[email protected]>
Reviewed-by: Muchun Song <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Fanjun Kong authored and Jens Axboe committed 2022-05-17 06:12:23 -06:00
1 parent 3607849df4
commit 77c570a1ea
1 file changed
+1 -3
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block/blk-cgroup.c
+1 -3
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@@ -1278,14 +1278,13 @@ int blkcg_init_queue(struct request_queue *q)
preloaded = !radix_tree_preload(GFP_KERNEL);
/* Make sure the root blkg exists. */
rcu_read_lock();
/* spin_lock_irq can serve as RCU read-side critical section. */
spin_lock_irq(&q->queue_lock);
blkg = blkg_create(&blkcg_root, q, new_blkg);
if (IS_ERR(blkg))
goto err_unlock;
q->root_blkg = blkg;
spin_unlock_irq(&q->queue_lock);
rcu_read_unlock();
if (preloaded)
radix_tree_preload_end();
@@ -1311,7 +1310,6 @@ err_destroy_all:
return ret;
err_unlock:
spin_unlock_irq(&q->queue_lock);
rcu_read_unlock();
if (preloaded)
radix_tree_preload_end();
return PTR_ERR(blkg);