linux-kernel - Re: 2.6.27-rc1 (2fca5c): libata: kernel cant boot

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Message-ID: <20081025184506.GM22217@kernel.dk>
Date:	Sat, 25 Oct 2008 20:45:08 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Petr Vandrovec <vandrove@...cvut.cz>
Cc:	Elias Oltmanns <eo@...ensachen.de>,
	Paul Mundt <lethal@...ux-sh.org>,
	Alexander Beregalov <a.beregalov@...il.com>, tj@...nel.org,
	torvalds@...ux-foundation.org, LKML <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org
Subject: Re: 2.6.27-rc1 (2fca5c): libata: kernel cant boot

On Sat, Oct 25 2008, Petr Vandrovec wrote:
> Jens Axboe wrote:
> >On Fri, Oct 24 2008, Elias Oltmanns wrote:
> >>Jens Axboe <jens.axboe@...cle.com> wrote:
> >>>From e598055dde1951c47c8b3522616f6ebff0ed9847 Mon Sep 17 00:00:00 2001
> >>>From: Jens Axboe <jens.axboe@...cle.com>
> >>>Date: Fri, 24 Oct 2008 09:22:42 +0200
> >>>Subject: [PATCH] libata: fix bug with non-ncq devices
> >>>
> >>>The recent commit 201f1b98822078c808b5e2d379a6ddbfc0a06ee1 to enable
> >>Wouldn't that be commit 2fca5ccf97d2c28bcfce44f5b07d85e74e3cd18e?
> >
> >Yes that is correct, the other commit is actually a private one in my
> >tree for other libata changes. Updated patch below, thanks for checking!
> >
> >From e598055dde1951c47c8b3522616f6ebff0ed9847 Mon Sep 17 00:00:00 2001
> >From: Jens Axboe <jens.axboe@...cle.com>
> >Date: Fri, 24 Oct 2008 09:22:42 +0200
> >Subject: [PATCH] libata: fix bug with non-ncq devices
> 
> Hello,
>   this fixes my DVD, but unfortunately NCQ devices connected to PMP are 
> still dead - apparently as soon as mount() tries to do serious I/O on 
> the drive.  Backing out both post-2.6.28-rc1 fix as well as your 
> original change brings storage back.  I suspect that problem is that 
> with PMP same tag cannot be (should not be?  must not be?) used on 
> multiple devices behind PMP - and before your change tags were allocated 
> per-port, while now they are allocated per-device.

That would indeed break, this requires allocating the tag map in the

-- 
Jens Axboe

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