PCI/PM: Fix proc config reg access for D3cold and bridge suspending
authorHuang Ying <ying.huang@intel.com>
Thu, 25 Oct 2012 01:36:03 +0000 (09:36 +0800)
committerBjorn Helgaas <bhelgaas@google.com>
Mon, 5 Nov 2012 17:46:23 +0000 (10:46 -0700)
commitb3c32c4f9565f93407921c0d8a4458042eb8998e
tree9c035788cf5a2f5fcf897f3fe63c32064bdef255
parent3ff2de9ba1a2e22e548979dbcd46e999b22c93d8
PCI/PM: Fix proc config reg access for D3cold and bridge suspending

In https://bugzilla.kernel.org/show_bug.cgi?id=48981
Peter reported that /proc/bus/pci/??/??.? does not work for 3.6.
This is because the device configuration space registers are
not accessible if the corresponding parent bridge is suspended or
the device is put into D3cold state.

This is the same as /sys/bus/pci/devices/0000:??:??.?/config access
issue.  So the function used to solve sysfs issue is used to solve
this issue.

This patch moves pci_config_pm_runtime_get()/_put() from pci/pci-sysfs.c
to pci/pci.c and makes them extern so they can be used by both the
sysfs and proc paths.

[bhelgaas: changelog, references, reporters]
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=48981
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=49031
Reported-by: Forrest Loomis <cybercyst@gmail.com>
Reported-by: Peter <lekensteyn@gmail.com>
Reported-by: Micael Dias <kam1kaz3@gmail.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
CC: stable@vger.kernel.org # v3.6+
drivers/pci/pci-sysfs.c
drivers/pci/pci.c
drivers/pci/pci.h
drivers/pci/proc.c