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blk-cgroup: cleanup blk_cgroup_congested

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Use blkcg_css instead of open coding it, and switch to a slightly
more natural for loop.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-14-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-04-20 06:27:21 +02:00 committed by Jens Axboe
parent bc5fee91f2
commit d200ca143a
1 changed files with 1 additions and 5 deletions
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6
block/blk-cgroup.c
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@ -2038,15 +2038,11 @@ bool blk_cgroup_congested(void)
bool ret = false;
rcu_read_lock();
css = kthread_blkcg();
if (!css)
css = task_css(current, io_cgrp_id);
while (css) {
for (css = blkcg_css(); css; css = css->parent) {
if (atomic_read(&css->cgroup->congestion_count)) {
ret = true;
break;
}
css = css->parent;
}
rcu_read_unlock();
return ret;