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AMD IOMMU: set cmd buffer pointers to zero manually 

Impact: set cmd buffer head and tail pointers to zero in case nobody else did

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
hifive-unleashed-5.1
Joerg Roedel 2008-12-17 15:06:01 +01:00
parent 83fd5cc648
commit cf558d25e5
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kernel/amd_iommu_init.c
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@ -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;