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iommu/amd: Prevent binding other PCI drivers to IOMMU PCI devices

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AMD IOMMU driver makes use of IOMMU PCI devices, so prevent binding other
PCI drivers to IOMMU PCI devices.

This fixes a bug reported by Boris that system suspend/resume gets broken
on AMD platforms. For more information, please refer to:
	https://lkml.org/lkml/2015/9/26/89

Fixes: 991de2e590 ("PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()")
Signed-off-by: Jiang Liu <[email protected]>
Cc: Borislav Petkov <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
This commit is contained in:
Jiang Liu authored and Joerg Roedel committed 2015-10-09 17:47:15 +02:00
1 parent 02685b1df0
commit cbbc00be2c
1 file changed
+3
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drivers/iommu/amd_iommu_init.c
+3
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@@ -1256,6 +1256,9 @@ static int iommu_init_pci(struct amd_iommu *iommu)
if (!iommu->dev)
return -ENODEV;
/* Prevent binding other PCI device drivers to IOMMU devices */
iommu->dev->match_driver = false;
pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
&iommu->cap);
pci_read_config_dword(iommu->dev, cap_ptr + MMIO_RANGE_OFFSET,