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PCI: Don't oops on virtual buses in acpi_pci_get_bridge_handle()

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acpi_pci_get_bridge_handle() returns the ACPI handle for the bridge device
(either a host bridge or a PCI-to-PCI bridge) leading to a PCI bus.  But
SR-IOV virtual functions can be on a virtual bus with no bridge leading to
it.  Return a NULL acpi_handle in this case instead of trying to
dereference the NULL pointer to the bridge.

This fixes a NULL pointer dereference oops in pci_get_hp_params() when
adding SR-IOV VF devices on virtual buses.

[bhelgaas: changelog, add comment in code]
Fixes: 6cd33649fa ("PCI: Add pci_configure_device() during enumeration")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=87591
Reported-by: Chao Zhou <chao.zhou@intel.com>
Reported-by: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yinghai Lu 2014-10-30 10:17:25 -06:00 committed by Bjorn Helgaas
parent d8e7d53a2f
commit 32f638fc11
1 changed files with 6 additions and 1 deletions
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7
include/linux/pci-acpi.h
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@ -41,8 +41,13 @@ static inline acpi_handle acpi_pci_get_bridge_handle(struct pci_bus *pbus)
if (pci_is_root_bus(pbus))
dev = pbus->bridge;
else
else {
/* If pbus is a virtual bus, there is no bridge to it */
if (!pbus->self)
return NULL;
dev = &pbus->self->dev;
}
return ACPI_HANDLE(dev);
}