From: Christoph Hellwig <hch@lst.de>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>,
linux-block@vger.kernel.org
Subject: Re: [PATCH 1/3] blk-mq: protect q->elevator by ->sysfs_lock
Date: Wed, 15 Jun 2022 08:01:40 +0200 [thread overview]
Message-ID: <20220615060140.GC22115@lst.de> (raw)
In-Reply-To: <20220615023712.750122-2-ming.lei@redhat.com>
On Wed, Jun 15, 2022 at 10:37:10AM +0800, Ming Lei wrote:
> elevator can be tore down by sysfs switch interface or disk release, so
> hold ->sysfs_lock before referring to q->elevator, then potential
> use-after-free can be avoided.
The subject probably should really talk about blk_mq_elv_switch_none
as we generally already protect ->elevator with ->sysfs_lock.
Otherwise looks good:
Reviewed-by: Christoph Hellwig <hch@lst.de>
next prev parent reply other threads:[~2022-06-15 6:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-15 2:37 [PATCH 0/3] blk-mq: three misc patches Ming Lei
2022-06-15 2:37 ` [PATCH 1/3] blk-mq: protect q->elevator by ->sysfs_lock Ming Lei
2022-06-15 6:01 ` Christoph Hellwig [this message]
2022-06-15 2:37 ` [PATCH 2/3] blk-mq: avoid to touch q->elevator without any protection Ming Lei
2022-06-15 6:04 ` Christoph Hellwig
2022-06-15 2:37 ` [PATCH 3/3] blk-mq: don't clear flush_rq from tags->rqs[] Ming Lei
2022-06-15 6:22 ` Christoph Hellwig
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