linux-kernel - Re: [PATCH 55/91] Make scsi_free_queue() kill pending SCSI commands

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Message-ID: <CAO+b5-pNeQmzNh_tfxumTnJa6w0g9dg-DuAY893KgwKPnBgjMg@mail.gmail.com>
Date:	Mon, 6 Feb 2012 08:28:48 +0100
From:	Bart Van Assche <bvanassche@....org>
To:	Willy Tarreau <w@....eu>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	James Bottomley <JBottomley@...allels.com>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 55/91] Make scsi_free_queue() kill pending SCSI commands

On Sun, Feb 5, 2012 at 11:10 PM, Willy Tarreau <w@....eu> wrote:
>
> 2.6.27-longterm review patch.  If anyone has any objections, please let us know.
>
> ------------------
>
> commit 3308511c93e6ad0d3c58984ecd6e5e57f96b12c8 upstream.
>
> Make sure that SCSI device removal via scsi_remove_host() does finish
> all pending SCSI commands. Currently that's not the case and hence
> removal of a SCSI host during I/O can cause a deadlock. See also
> "blkdev_issue_discard() hangs forever if underlying storage device is
> removed" (http://bugzilla.kernel.org/show_bug.cgi?id=40472). See also
> http://lkml.org/lkml/2011/8/27/6.

If you backport that commit, you should backport commit
745718132c3c7cac98a622b610e239dcd5217f71 too. See e.g.
http://lkml.org/lkml/2011/11/8/22.

Bart.
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