linux-kernel - [PATCH 2.6.29-rc7 1/2] x86: fix iommu=nodac parameter handling

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Message-ID: <49ADE82D.40103@kernel.org>
Date:	Wed, 04 Mar 2009 11:32:13 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	pgnet.trash@...il.com
Subject: [PATCH 2.6.29-rc7 1/2] x86: fix iommu=nodac parameter handling

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

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

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index b254285..69c7a8d 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -197,7 +197,7 @@ 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;
--
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