From: Tejun Heo <tj@kernel.org>
Subject: x86: fix iommu=nodac parameter handling
References: bnc#463829

nodac should forbid dac not instead of enabling it.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Tejun Heo <teheo@suse.de>
---
 arch/x86/kernel/pci-dma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.27-SLE11_BRANCH/arch/x86/kernel/pci-dma.c
===================================================================
--- linux-2.6.27-SLE11_BRANCH.orig/arch/x86/kernel/pci-dma.c
+++ linux-2.6.27-SLE11_BRANCH/arch/x86/kernel/pci-dma.c
@@ -175,7 +175,7 @@ static __init int iommu_setup(char *p)
 		if (!strncmp(p, "allowdac", 8))
 			forbid_dac = 0;
 		if (!strncmp(p, "nodac", 5))
-			forbid_dac = -1;
+			forbid_dac = 1;
 		if (!strncmp(p, "usedac", 6)) {
 			forbid_dac = -1;
 			return 1;