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| author | Joerg Roedel <joerg.roedel@amd.com> | 2011-06-06 16:50:14 +0200 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2011-06-07 10:06:59 +0200 |
| commit | 26018874e3584f1658570d41d57d4c34f6a53aa0 (patch) | |
| tree | cc59523e0e25e6212cae86a93f90e2023f334633 | |
| parent | 27c2127a15d340706c0aa84e311188a14468d841 (diff) | |
| download | kernel_samsung_crespo-26018874e3584f1658570d41d57d4c34f6a53aa0.zip kernel_samsung_crespo-26018874e3584f1658570d41d57d4c34f6a53aa0.tar.gz kernel_samsung_crespo-26018874e3584f1658570d41d57d4c34f6a53aa0.tar.bz2 | |
x86/amd-iommu: Fix boot crash with hidden PCI devices
Some PCIe cards ship with a PCI-PCIe bridge which is not
visible as a PCI device in Linux. But the device-id of the
bridge is present in the IOMMU tables which causes a boot
crash in the IOMMU driver.
This patch fixes by removing these cards from the IOMMU
handling. This is a pure -stable fix, a real fix to handle
this situation appriatly will follow for the next merge
window.
Cc: stable@kernel.org # > 2.6.32
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index b2c309b..7c3a95e 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -155,6 +155,10 @@ static int iommu_init_device(struct device *dev) pdev = pci_get_bus_and_slot(PCI_BUS(alias), alias & 0xff); if (pdev) dev_data->alias = &pdev->dev; + else { + kfree(dev_data); + return -ENOTSUPP; + } atomic_set(&dev_data->bind, 0); @@ -164,6 +168,20 @@ static int iommu_init_device(struct device *dev) return 0; } +static void iommu_ignore_device(struct device *dev) +{ + u16 devid, alias; + + devid = get_device_id(dev); + alias = amd_iommu_alias_table[devid]; + + memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry)); + memset(&amd_iommu_dev_table[alias], 0, sizeof(struct dev_table_entry)); + + amd_iommu_rlookup_table[devid] = NULL; + amd_iommu_rlookup_table[alias] = NULL; +} + static void iommu_uninit_device(struct device *dev) { kfree(dev->archdata.iommu); @@ -193,7 +211,9 @@ int __init amd_iommu_init_devices(void) continue; ret = iommu_init_device(&pdev->dev); - if (ret) + if (ret == -ENOTSUPP) + iommu_ignore_device(&pdev->dev); + else if (ret) goto out_free; } |