linux-kernel - [Bugfix v4 1/2] iommu/amd: Prevent binding other PCI drivers to IOMMU PCI devices

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Date:	Fri,  9 Oct 2015 22:07:31 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...en8.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Alex Deucher <alexdeucher@...il.com>,
	Christian Knig <christian.koenig@....com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-iommu@...r.kernel.org, linux-acpi@...r.kernel.org,
	x86@...nel.org
Subject: [Bugfix v4 1/2] 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@...ux.intel.com>
Cc: Borislav Petkov <bp@...en8.de>
---
 drivers/iommu/amd_iommu_init.c |    3 +++
 1 file changed, 3 insertions(+)

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,
-- 
1.7.10.4

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