Clear tags in dmar.c

[Li, Zhen-Hua]

In dmar.c: qi_check_fault, I think the tags should be clear when
finished processing.
See this patch:

--- drivers/iommu/dmar.c.orig   2012-12-25 00:56:16.000000000 +0800
+++ drivers/iommu/dmar.c.new    2012-12-25 00:56:37.000000000 +0800
@@ -759,7 +759,7 @@ static int qi_check_fault(struct intel_i
                                        sizeof(struct qi_desc));
                        __iommu_flush_cache(iommu, &qi->desc[index],
                                        sizeof(struct qi_desc));
-                       writel(DMA_FSTS_IQE, iommu->reg + DMAR_FSTS_REG);
+                       writel(~DMA_FSTS_IQE, iommu->reg + DMAR_FSTS_REG);
                        return -EINVAL;
                }
        }
@@ -775,7 +775,7 @@ static int qi_check_fault(struct intel_i
                tail = readl(iommu->reg + DMAR_IQT_REG);
                tail = ((tail >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH;

-               writel(DMA_FSTS_ITE, iommu->reg + DMAR_FSTS_REG);
+               writel(~DMA_FSTS_ITE, iommu->reg + DMAR_FSTS_REG);

                do {
                        if (qi->desc_status[head] == QI_IN_USE)
@@ -788,7 +788,7 @@ static int qi_check_fault(struct intel_i
        }

        if (fault & DMA_FSTS_ICE)
-               writel(DMA_FSTS_ICE, iommu->reg + DMAR_FSTS_REG);
+               writel(~DMA_FSTS_ICE, iommu->reg + DMAR_FSTS_REG);

        return 0;
 }
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