Commit b548e786 authored Jul 13, 2016 by Joerg Roedel

iommu/amd: Init unity mappings only for dma_ops domains



The default domain for a device might also be
identity-mapped. In this case the kernel would crash when
unity mappings are defined for the device. Fix that by
making sure the domain is a dma_ops domain.

Fixes: 0bb6e243 ('iommu/amd: Support IOMMU_DOMAIN_DMA type allocation')
Cc: stable@vger.kernel.org # v4.2+
Signed-off-by: Joerg Roedel <jroedel@suse.de>

parent cf7513e7

drivers/iommu/amd_iommu.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -467,9 +467,11 @@ static void init_iommu_group(struct device *dev)
		if (!domain)
		goto out;

		if (to_pdomain(domain)->flags == PD_DMA_OPS_MASK) {
		dma_domain = to_pdomain(domain)->priv;

		init_unity_mappings_for_device(dev, dma_domain);
		}

		out:
		iommu_group_put(group);
		}