From: Omar Sandoval <osandov@osandov.com>
To: Jens Axboe <axboe@fb.com>
Cc: linux-block@vger.kernel.org, bart.vanassche@sandisk.com,
hch@lst.de, osandov@fb.com, paolo.valente@linaro.org,
hare@suse.com
Subject: Re: [PATCH 2/5] blk-mq: fix potential race in queue restart and driver tag allocation
Date: Thu, 26 Jan 2017 12:04:57 -0800 [thread overview]
Message-ID: <20170126200457.GB21449@vader.DHCP.thefacebook.com> (raw)
In-Reply-To: <e70e18cb-56fc-ca03-8845-8b1a1dea6953@fb.com>
On Thu, Jan 26, 2017 at 12:52:15PM -0700, Jens Axboe wrote:
> I screwed this up when splitting up the patchset, that last break needs to
> be removed as well, of course. Updated below:
>
>
> From 9d68cf9232c06a793e305d10b6d655df4beae928 Mon Sep 17 00:00:00 2001
> From: Jens Axboe <axboe@fb.com>
> Date: Thu, 26 Jan 2017 12:50:36 -0700
> Subject: [PATCH 1/4] blk-mq: fix potential race in queue restart and driver
> tag allocation
>
> Once we mark the queue as needing a restart, re-check if we can
> get a driver tag. This fixes a theoretical issue where the needed
> IO completes _after_ blk_mq_get_driver_tag() fails, but before we
> manage to set the restart bit.
Reviewed-by: Omar Sandoval <osandov@fb.com>
> Signed-off-by: Jens Axboe <axboe@fb.com>
> ---
> block/blk-mq.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
next prev parent reply other threads:[~2017-01-26 20:05 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-26 19:48 [PATCH 0/5] blk-mq: various blk-mq/blk-mq-sched fixes Jens Axboe
2017-01-26 19:48 ` [PATCH 1/5] blk-mq: improve scheduler queue sync/async running Jens Axboe
2017-01-26 19:59 ` Omar Sandoval
2017-01-26 19:48 ` [PATCH 2/5] blk-mq: fix potential race in queue restart and driver tag allocation Jens Axboe
2017-01-26 19:52 ` Jens Axboe
2017-01-26 20:04 ` Omar Sandoval [this message]
2017-01-26 19:48 ` [PATCH 3/5] blk-mq: release driver tag on a requeue event Jens Axboe
2017-01-26 20:06 ` Omar Sandoval
2017-01-26 19:48 ` [PATCH 4/5] blk-mq-sched: fix starvation for multiple hardware queues and shared tags Jens Axboe
2017-01-26 20:25 ` Omar Sandoval
2017-01-26 20:26 ` Jens Axboe
2017-01-26 19:48 ` [PATCH 5/5] blk-mq-sched: change ->dispatch_requests() to ->dispatch_request() Jens Axboe
2017-01-26 20:54 ` Omar Sandoval
2017-01-26 20:59 ` Jens Axboe
2017-01-26 21:11 ` Omar Sandoval
2017-01-26 21:15 ` Jens Axboe
2017-01-27 12:10 ` [PATCH 0/5] blk-mq: various blk-mq/blk-mq-sched fixes Hannes Reinecke
2017-01-27 14:40 ` Jens Axboe
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