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>

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index faf10ba..b6ecddb 100644 (file)
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -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();