Techwizz/kernel-fxtec-pro1x
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blk-cgroup: hold the queue ref during throttling

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The blkg lifetime is protected by the queue lifetime, so we need to put
the queue _after_ we're done using the blkg.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Josef Bacik 2018-07-31 12:39:03 -04:00 committed by Jens Axboe
parent 52a1199ccd
commit cc7ecc2585
1 changed files with 1 additions and 1 deletions
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block/blk-cgroup.c
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@ -1759,10 +1759,10 @@ void blkcg_maybe_throttle_current(void)
if (!blkg) if (!blkg)
goto out; goto out;
rcu_read_unlock(); rcu_read_unlock();
blk_put_queue(q);
blkcg_maybe_throttle_blkg(blkg, use_memdelay); blkcg_maybe_throttle_blkg(blkg, use_memdelay);
blkg_put(blkg); blkg_put(blkg);
blk_put_queue(q);
return; return;
out: out:
rcu_read_unlock(); rcu_read_unlock();