| commit | 5aeac7c4b16069aae49005f0a8d4526baa83341b | [log] [tgz] |
|---|---|---|
| author | Tejun Heo <tj@kernel.org> | Tue Sep 01 14:52:31 2020 -0400 |
| committer | Jens Axboe <axboe@kernel.dk> | Tue Sep 01 16:48:44 2020 -0600 |
| tree | d380ddce8bf1e1a8d2e043e1491ba3da588ef89f | |
| parent | 08fc1ab6d748ab1a690fd483f41e2938984ce353 [diff] |
blk-iocost: ioc_pd_free() shouldn't assume irq disabled
ioc_pd_free() grabs irq-safe ioc->lock without ensuring that irq is disabled
when it can be called with irq disabled or enabled. This has a small chance
of causing A-A deadlocks and triggers lockdep splats. Use irqsave operations
instead.
Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 7caa47151ab2 ("blkcg: implement blk-iocost")
Cc: stable@vger.kernel.org # v5.4+
Signed-off-by: Jens Axboe <axboe@kernel.dk>