linux-kernel - Re: [PATCH] Missing critical phys_to

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Date:	Sun, 04 Feb 2007 21:36:15 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	stable@...nel.org
CC:	David Moore <dcm@....EDU>,
	linux-kernel <linux-kernel@...r.kernel.org>, discuss@...-64.org,
	akpm@...ux-foundation.org,
	linux1394-devel <linux1394-devel@...ts.sourceforge.net>,
	Jan Beulich <jbeulich@...ell.com>
Subject: Re: [PATCH] Missing critical phys_to_virt in lib/swiotlb.c

David Moore wrote:
[...]
> considering the severity of this one-liner bug, I would like to
> request that this simplified patch make it into 2.6.20, despite how
> close we are to the final cut.

So we were too close. Maybe the -stable team likes to have it in 2.6.20.1.

> It fixes real crashes:
> http://lists.opensuse.org/opensuse-bugs/2006-12/msg02943.html
> http://qa.mandriva.com/show_bug.cgi?id=28224
> http://www.pchdtv.com/forum/viewtopic.php?t=2063&sid=a959a14a4c2db0eebaab7b0df56103ce

and FireWire crashes too.

> --- linux-2.6.19.x86_64/lib/swiotlb.c.orig	2007-02-04 13:18:41.000000000 -0500
> +++ linux-2.6.19.x86_64/lib/swiotlb.c	2007-02-04 13:19:43.000000000 -0500
> @@ -750,7 +750,7 @@ swiotlb_sync_sg(struct device *hwdev, st
>  
>  	for (i = 0; i < nelems; i++, sg++)
>  		if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
> -			sync_single(hwdev, (void *) sg->dma_address,
> +			sync_single(hwdev, phys_to_virt(sg->dma_address),
>  				    sg->dma_length, dir, target);
>  }
>  
-- 
Stefan Richter
-=====-=-=== --=- --=--
http://arcgraph.de/sr/
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