Commit f528d980 authored Feb 06, 2013 by Joerg Roedel

iommu/amd: Initialize device table after dma_ops



When dma_ops are initialized the unity mappings are
created. The init_device_table_dma() function makes sure DMA
from all devices is blocked by default. This opens a short
window in time where DMA to unity mapped regions is blocked
by the IOMMU. Make sure this does not happen by initializing
the device table after dma_ops.

Cc: stable@vger.kernel.org
Signed-off-by: Joerg Roedel <joro@8bytes.org>

parent 88b62b91

drivers/iommu/amd_iommu_init.c

+5 −5

Original line number	Diff line number	Diff line
		@@ -1876,11 +1876,6 @@ static int amd_iommu_init_dma(void)
		struct amd_iommu *iommu;
		int ret;

		init_device_table_dma();

		for_each_iommu(iommu)
		iommu_flush_all_caches(iommu);

		if (iommu_pass_through)
		ret = amd_iommu_init_passthrough();
		else
		@@ -1889,6 +1884,11 @@ static int amd_iommu_init_dma(void)
		if (ret)
		return ret;

		init_device_table_dma();

		for_each_iommu(iommu)
		iommu_flush_all_caches(iommu);

		amd_iommu_init_api();

		amd_iommu_init_notifier();

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