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Commit cf558d25 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

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: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 83fd5cc6

arch/x86/kernel/amd_iommu_init.c

+4 −0
Original line number Diff line number Diff line
@@ -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;