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authorTejun Heo <tj@kernel.org>2009-10-26 15:41:46 +0100
committerIngo Molnar <mingo@elte.hu>2009-11-08 13:19:05 +0100
commit2ae8bb75db1f3de422eb5898f2a063c46c36dba8 (patch)
treeebdf989299d9e5ec460e164671af0dbdbee13f4b /arch/x86/kernel/pci-dma.c
parent338bac527ed0e35b4cb50390972f15d3cbce92ca (diff)
x86: Fix iommu=nodac parameter handling
iommu=nodac should forbid dac instead of enabling it. Fix it. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Matteo Frigo <athena@fftw.org> Cc: <stable@kernel.org> # .32.x and older LKML-Reference: <4AE5B52A.4050408@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/pci-dma.c')
-rw-r--r--arch/x86/kernel/pci-dma.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index ce2fb91bbed1..839d49a669bc 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -216,7 +216,7 @@ 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;