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

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Message-Id: <20070205133556.9b290d0a.akpm@linux-foundation.org>
Date:	Mon, 5 Feb 2007 13:35:56 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Moore <dcm@....EDU>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>, discuss@...-64.org,
	linux1394-devel <linux1394-devel@...ts.sourceforge.net>,
	Jan Beulich <jbeulich@...ell.com>, Andi Kleen <ak@...e.de>
Subject: Re: [PATCH] Missing critical phys_to_virt in lib/swiotlb.c

On Sun, 04 Feb 2007 13:39:40 -0500
David Moore <dcm@....EDU> wrote:

> From: David Moore <dcm@....org>
> 
> Adds missing call to phys_to_virt() in the
> lib/swiotlb.c:swiotlb_sync_sg() function.  Without this change, a kernel
> panic will always occur whenever a SWIOTLB bounce buffer from a
> scatter-gather list gets synced.
> 
> Signed-off-by: David Moore <dcm@....org>
> ---
> 
> This change was originally part of a larger patch by Jan Beulich, which
> was more extensive and doesn't look destined to make it into 2.6.20:
> http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20-rc6/2.6.20-rc6-mm3/broken-out/ia64-swiotlb-bug-fixes.patch
> 
> However, 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.  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
> 
> --- 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);
>  }
>  

argh.  I didn't know that Jan's patches fixed crashes.  I thought they were
ia64-only things.

Who maintains the swiotlb code?

I shall queue this up, tag it for 2.6.20.1, then I'll fix up Jan's alleged
ia64 patches to account for that.  I'll still push it through Tony, but the
x86_64/ia64 linkage here seems to be a source of problems.


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