From: Bart Van Assche <bvanassche@acm.org>
To: "Zhuang, Jin Can" <jin.can.zhuang@intel.com>
Cc: linux-scsi <linux-scsi@vger.kernel.org>,
James Bottomley <jbottomley@parallels.com>,
Mike Christie <michaelc@cs.wisc.edu>,
Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>,
Chanho Min <chanho.min@lge.com>
Subject: Re: [PATCH 6/7] Fix race between starved list processing and device removal
Date: Mon, 29 Oct 2012 15:32:15 +0100 [thread overview]
Message-ID: <508E936F.7050004@acm.org> (raw)
In-Reply-To: <267107B7B5D6404FB174AB273F79D8BD1A4C39@SHSMSX101.ccr.corp.intel.com>
On 10/28/12 19:01, Zhuang, Jin Can wrote:
> I recently ran into the same issue
> The test I did is plug/unplug u-disk in an interval of 1 second. And
> I found when sdev1 is being removed, scsi_run_queue is triggered by
> sdev2, which then accesses all the starving scsi device including sdev1.
>
> I have adopted the solution below which works fine for me so far.
> But there's one thing to fix in the patch below. When it put_device
> in scsi_run_queue, irq is disabled. As put_device may get into sleep,
> irq should be enabled before it's called.
Hello Jincan,
Thanks for testing and the feedback. However, are you sure that
put_device() for a SCSI device may sleep ? Have you noticed the
execute_in_process_context() call in scsi_device_dev_release() ?
Bart.
next prev parent reply other threads:[~2012-10-29 14:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-26 12:00 [PATCH 0/7 v5] More device removal fixes Bart Van Assche
2012-10-26 12:01 ` [PATCH 1/7] block: Avoid that blk_drain_queue() finishes early Bart Van Assche
2012-10-29 1:47 ` Tejun Heo
2012-10-29 1:52 ` Tejun Heo
2012-10-29 14:35 ` Bart Van Assche
2012-10-26 12:02 ` [PATCH 2/7] block: Let blk_drain_queue() caller obtain the queue lock Bart Van Assche
2012-10-29 1:55 ` Tejun Heo
2012-10-26 12:02 ` [PATCH 3/7] block: Rename queue dead flag Bart Van Assche
2012-10-26 12:03 ` [PATCH 4/7] block: Avoid that request_fn is invoked on a dead queue Bart Van Assche
2012-10-29 1:59 ` Tejun Heo
2012-10-26 12:04 ` [PATCH 5/7] block: Make blk_cleanup_queue() wait until request_fn finished Bart Van Assche
2012-10-29 2:00 ` Tejun Heo
2012-10-26 12:05 ` [PATCH 6/7] Fix race between starved list processing and device removal Bart Van Assche
2012-10-28 18:01 ` Zhuang, Jin Can
2012-10-29 14:32 ` Bart Van Assche [this message]
2012-10-30 5:40 ` Zhuang, Jin Can
2012-11-02 10:48 ` Bart Van Assche
2012-11-21 11:06 ` Bart Van Assche
[not found] ` <026701cdb8c3$d2e3cb50$78ab61f0$@min@lge.com>
2012-11-21 12:10 ` Bart Van Assche
2012-10-29 2:07 ` Tejun Heo
2012-10-26 12:05 ` [PATCH 7/7] Remove get_device() / put_device() pair from scsi_request_fn() Bart Van Assche
2012-10-29 2:08 ` Tejun Heo
2012-11-23 10:37 ` [PATCH 0/7 v5] More device removal fixes Bart Van Assche
2012-11-26 17:19 ` Bart Van Assche
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