From: Tejun Heo <tj@kernel.org>
To: Shaohua Li <shaohua.li@intel.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>,
Knut Petersen <Knut_Petersen@t-online.de>,
mroos@linux.ee
Subject: Re: [patch]block: fix ioc locking warning
Date: Mon, 6 Feb 2012 08:22:22 -0800 [thread overview]
Message-ID: <20120206162222.GB3926@google.com> (raw)
In-Reply-To: <1328514611.21268.66.camel@sli10-conroe>
Hello,
On Mon, Feb 06, 2012 at 03:50:11PM +0800, Shaohua Li wrote:
> diff --git a/block/blk-ioc.c b/block/blk-ioc.c
> index 27a06e0..7490b6d 100644
> --- a/block/blk-ioc.c
> +++ b/block/blk-ioc.c
> @@ -204,7 +204,9 @@ void put_io_context(struct io_context *ioc, struct request_queue *locked_q)
> spin_unlock(last_q->queue_lock);
> last_q = NULL;
>
> - if (!spin_trylock(this_q->queue_lock))
> + /* spin_trylock() always successes in UP case */
> + if (this_q != locked_q &&
> + !spin_trylock(this_q->queue_lock))
Yeah, this is the right thing to do. I think the comment is slightly
misleading. I'll prep a patch.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-02-06 16:22 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-06 7:50 [patch]block: fix ioc locking warning Shaohua Li
2012-02-06 7:55 ` Jens Axboe
2012-02-06 15:12 ` Vivek Goyal
2012-02-06 16:09 ` Jens Axboe
2012-02-06 16:37 ` Vivek Goyal
2012-02-06 16:44 ` Tejun Heo
2012-02-06 16:58 ` Linus Torvalds
2012-02-06 17:27 ` Tejun Heo
2012-02-06 20:16 ` Jens Axboe
2012-02-06 21:54 ` [PATCH] block: strip out locking optimization in put_io_context() Tejun Heo
2012-02-07 6:49 ` Jens Axboe
2012-02-07 16:22 ` Tejun Heo
2012-02-07 16:28 ` Jens Axboe
2012-02-07 16:33 ` Linus Torvalds
2012-02-07 16:47 ` Tejun Heo
2012-02-07 17:17 ` Tejun Heo
2012-02-08 0:19 ` Shaohua Li
2012-02-08 8:29 ` Shaohua Li
2012-02-08 16:29 ` Tejun Heo
2012-02-08 16:34 ` Linus Torvalds
2012-02-08 16:49 ` Tejun Heo
2012-02-08 16:56 ` Tejun Heo
2012-02-08 17:23 ` Tejun Heo
2012-02-09 6:22 ` Shaohua Li
2012-02-09 17:59 ` Tejun Heo
2012-02-09 18:07 ` Linus Torvalds
2012-02-09 19:24 ` Tejun Heo
2012-02-09 23:48 ` Tejun Heo
2012-02-10 5:14 ` Shaohua Li
2012-02-10 8:48 ` Shaohua Li
2012-02-11 2:17 ` Tejun Heo
2012-02-11 11:35 ` Jens Axboe
2012-02-13 1:34 ` Shaohua Li
2012-02-13 20:49 ` Tejun Heo
2012-02-14 2:36 ` Shaohua Li
2012-02-14 16:39 ` Tejun Heo
2012-02-10 3:09 ` Shaohua Li
2012-02-07 23:00 ` [PATCH] block: fix lockdep warning on io_context release put_io_context() Tejun Heo
2012-02-06 20:36 ` [patch]block: fix ioc locking warning Tejun Heo
2012-02-07 0:31 ` Shaohua Li
2012-02-07 0:39 ` Tejun Heo
2012-02-07 0:43 ` Shaohua Li
2012-02-07 0:59 ` Tejun Heo
2012-02-07 1:10 ` Shaohua Li
2012-02-07 1:33 ` Shaohua Li
2012-02-07 5:22 ` Shaohua Li
2012-02-07 22:34 ` Linus Torvalds
2012-02-06 16:22 ` Tejun Heo [this message]
2012-02-08 18:07 ` walt
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