linux-kernel - Re: sata badness in 2.6.20-rc1? [Was: Re: md patches in -mm]

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Date:	Tue, 19 Dec 2006 15:26:00 -0800 (PST)
From:	Luben Tuikov <ltuikov@...oo.com>
To:	Jurriaan <thunder7@...all.nl>, Andrew Morton <akpm@...l.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Jeff Garzik <jeff@...zik.org>,
	Neil Brown <neilb@...e.de>, Jurriaan <thunder7@...all.nl>,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	Tejun Heo <htejun@...il.com>, Alan <alan@...rguk.ukuu.org.uk>,
	Luben Tuikov <ltuikov@...oo.com>
Subject: Re: sata badness in 2.6.20-rc1? [Was: Re: md patches in -mm]

--- thunder7@...all.nl wrote:
> From: Andrew Morton <akpm@...l.org>
> Date: Sun, Dec 17, 2006 at 03:05:39AM -0800
> > On Sun, 17 Dec 2006 12:00:12 +0100
> > "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> > 
> > > Okay, I have identified the patch that causes the problem to appear, which is
> > > 
> > > fix-sense-key-medium-error-processing-and-retry.patch
> > > 
> > > With this patch reverted -rc1-mm1 is happily running on my test box.
> > 
> > That was rather unexpected.   Thanks.
> >
> I can confirm that 2.6.20-rc1-mm1 with this patch reverted mounts my
> raid6 partition without problems. This is x86_64 with SMP.
> 

The reason was that my dev tree was tainted by this bug:

        if (good_bytes &&
-           scsi_end_request(cmd, 1, good_bytes, !!result) == NULL)
+           scsi_end_request(cmd, 1, good_bytes, result == 0) == NULL)
                return;

in scsi_io_completion().  I had there !!result which is wrong, and when
I diffed against master, it produced a bad patch.

As James mentioned one of the chunks is good and can go in.

    Luben

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