linux-kernel - [GIT PULL] PCI / ACPI fix for 4.1-rc6

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Date:	Sat, 30 May 2015 01:39:19 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [GIT PULL] PCI / ACPI fix for 4.1-rc6

Hi Linus,

Please pull from

 git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git \
 acpi-pci-4.1-rc6

to receive a fix for the ACPI PCI host bridge initialization code
as commit dc4fdaf0e4839109169d8261814813816951c75f

 PCI / ACPI: Do not set ACPI companions for host bridges with parents

on top of commit ba155e2d21f6bf05de86a78dbe5bfd8757604a65

 Linux 4.1-rc5

This fixes a bug uncovered by a recent driver core change that
modified the implementation of the ACPI_COMPANION_SET() macro to
strictly rely on its second argument to be either NULL or a valid
pointer to struct acpi_device.

As it turns out, pcibios_root_bridge_prepare() on x86 and ia64
works with the assumption that the only code path calling
pci_create_root_bus() is pci_acpi_scan_root() and therefore
the sysdata argument passed to it will always match the
expectations of pcibios_root_bridge_prepare().  That need not
be the case, however, and in particular it is not the case for
the Xen pcifront driver that passes a pointer to its own private
data strcture as sysdata to pci_scan_bus_parented() which then
passes it to pci_create_root_bus() and it ends up being used
incorrectly by pcibios_root_bridge_prepare().

Thanks!

---------------

Rafael J. Wysocki (1):
      PCI / ACPI: Do not set ACPI companions for host bridges with parents

---------------

 arch/ia64/pci/pci.c | 13 ++++++++++---
 arch/x86/pci/acpi.c | 13 ++++++++++---
 2 files changed, 20 insertions(+), 6 deletions(-)
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