linux-kernel - Re: [patch 00/21] 2.6.19-stable review

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Date:	Wed, 21 Feb 2007 14:37:44 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Greg KH <greg@...ah.com>
CC:	Adrian Bunk <bunk@...sta.de>, Jan Beulich <jbeulich@...ell.com>,
	Andi Kleen <ak@....de>, linux-kernel@...r.kernel.org,
	stable@...nel.org, Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, David Moore <dcm@....EDU>
Subject: Re: [patch 00/21] 2.6.19-stable review

I wrote:
> I hope you can extract the patch from this MIME attachment.

Probably not unless I attach it for real.
-- 
Stefan Richter
-=====-=-=== --=- =-=-=
http://arcgraph.de/sr/

Subject: [PATCH] Missing critical phys_to_virt in lib/swiotlb.c
From: David Moore <dcm@....EDU>
Date: Sun, 04 Feb 2007 13:39:40 -0500

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>
Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---

This is a fraction of patch "[IA64] swiotlb bug fixes" in 2.6.20-git#,
commit cde14bbfb3aa79b479db35bd29e6c083513d8614. Unlike its heading
suggests, it is also important for EM64T.

Example crashes caused by swiotlb_sync_sg:
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);
 }