diff options
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r-- | arch/x86/kernel/amd_iommu_init.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c index c90a15eba5c5..c6cc22815d35 100644 --- 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) | |||
427 | memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET, | 427 | memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET, |
428 | &entry, sizeof(entry)); | 428 | &entry, sizeof(entry)); |
429 | 429 | ||
430 | /* set head and tail to zero manually */ | ||
431 | writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET); | ||
432 | writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); | ||
433 | |||
430 | iommu_feature_enable(iommu, CONTROL_CMDBUF_EN); | 434 | iommu_feature_enable(iommu, CONTROL_CMDBUF_EN); |
431 | 435 | ||
432 | return cmd_buf; | 436 | return cmd_buf; |