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

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: 991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()")
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 5ef347a13cb5..1b066e7d144d 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -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,