From: Yinghai Lu <yinghai@kernel.org>
Date: Thu, 30 Oct 2014 16:17:25 +0000 (-0600)
Subject: PCI: Don't oops on virtual buses in acpi_pci_get_bridge_handle()
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~152^2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=32f638fc11db0526c706454d9ab4339d55ac89f3;p=pandora-kernel.git

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

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: 6cd33649fa83 ("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>
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