From: Anton Arapov <aarapov@redhat.com>
Subject: [RHEL5.1 PATCH] BZ248102: Missing critical phys_to_virt in 	lib/swiotlb.c
Date: Sat, 04 Aug 2007 17:08:54 +0200
Bugzilla: 248102
Message-Id: <m3643v49rt.fsf@neuro-laptop.skynet>
Changelog: [misc] Missing critical phys_to_virt in lib/swiotlb.c



BZ#248102
  https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=248102

Description
  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.
  RHEL5 Kernel panics when loading megaraid_mbox module.

Upstream status
  in upstream
  commit# 93fbff63e62b87fe450814db41f859d60b048fb8 (2.6.20.git)

Test status
  tested for compilation.

==
diff -urpN linux-2.6.18.noarch.orig/lib/swiotlb.c linux-2.6.18.noarch/lib/swiotlb.c
--- linux-2.6.18.noarch.orig/lib/swiotlb.c	2007-08-04 12:52:04.000000000 +0200
+++ linux-2.6.18.noarch/lib/swiotlb.c	2007-08-04 12:53:17.000000000 +0200
@@ -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);
 }
 

--
Kernel Development, Anton Arapov <aarapov@redhat.com>