Merge branch 'iommu-fixes-2.6.28' of git://git.kernel.org/pub/scm/linux/kernel/git...

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index a7b6dec6fc3f4afc72f57651b1523156d415431b..0a60d60ed036b264e6d4c05174dfc3b464574852 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -235,8 +235,9 @@ static int iommu_completion_wait(struct amd_iommu *iommu)
        status &= ~MMIO_STATUS_COM_WAIT_INT_MASK;
        writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET);
 
-       if (unlikely((i == EXIT_LOOP_COUNT) && printk_ratelimit()))
-               printk(KERN_WARNING "AMD IOMMU: Completion wait loop failed\n");
+       if (unlikely(i == EXIT_LOOP_COUNT))
+               panic("AMD IOMMU: Completion wait loop failed\n");
+
 out:
        spin_unlock_irqrestore(&iommu->lock, flags);
 

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index c90a15eba5c5e42956d872527ff25dbfdc941ae6..c6cc22815d35f232dd21fae7d2718a3c161b373c 100644 (file)
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -427,6 +427,10 @@ static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
        memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
                        &entry, sizeof(entry));
 
+       /* set head and tail to zero manually */
+       writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
+       writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
+
        iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
 
        return cmd_buf;