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

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Date:	Fri, 24 Oct 2008 16:32:12 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	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 Fri, Oct 24, 2008 at 09:24:29AM +0200, Jens Axboe wrote:
> On Fri, Oct 24 2008, Paul Mundt wrote:
> > On Fri, Oct 24, 2008 at 09:13:29AM +0200, Jens Axboe wrote:
> > > Darn, this smells like a train wreck. I'm assuming this fixes it?
> > > 
> > Yes, that fixes it.
> 
> OK, that's pretty bad. 2.6.28-rc1 will not work on any box using libata
> with non-ncq disks. If you need me, I'll be at the bar.
> 
At least you only missed -rc1 by a few hours, it was a good effort.. :-)

> 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
> support for block layer tagging in libata was broken for non-NCQ
> devices. The block layer initializes the tag field to -1 to detect
> invalid uses of a tag, and if the libata devices does NOT support
> NCQ, we just used that field to index the internal command list.
> So we need to check for -1 first and only use the tag field if
> it's valid.
> 
> Signed-off-by: Jens Axboe <jens.axboe@...cle.com>

Tested-by: Paul Mundt <lethal@...ux-sh.org>

Thanks for the quick fix! Now I can go back to hacking on the stuff I
was avoiding..
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