[PATCH] pciehp: request control of each hotplug controller individually

This patch tweaks the way pciehp requests control of the hotplug
hardware from BIOS. It now tries to invoke the ACPI _OSC method
for a specific hotplug controller only, rather than walking the
entire acpi namespace invoking all possible _OSC methods under
all host bridges. This allows us to gain control of each hotplug
controller individually, even if BIOS fails to give us control of
some other hotplug controller in the system.

Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/pci/hotplug/pciehprm_acpi.c b/drivers/pci/hotplug/pciehprm_acpi.c
index 5d184582331e..5acdae3d52b1 100644
--- a/drivers/pci/hotplug/pciehprm_acpi.c
+++ b/drivers/pci/hotplug/pciehprm_acpi.c
@@ -143,12 +143,13 @@ static acpi_status acpi_run_oshp(acpi_handle handle)
 int get_hp_hw_control_from_firmware(struct pci_dev *dev)
 {
         acpi_status status;
+        acpi_handle handle = DEVICE_ACPI_HANDLE(&(dev->dev));
         /*
          * Per PCI firmware specification, we should run the ACPI _OSC
          * method to get control of hotplug hardware before using it
          */
-        /* Fixme: run _OSC for a specific host bridge, not all of them */
-        status = pci_osc_control_set(OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
+        status = pci_osc_control_set(handle,
+                        OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
 
         /* Fixme: fail native hotplug if _OSC does not exist for root ports */
         if (status == AE_NOT_FOUND) {
@@ -156,9 +157,7 @@ int get_hp_hw_control_from_firmware(struct pci_dev *dev)
                  * Some older BIOS's don't support _OSC but support
                  * OSHP to do the same thing
                  */
-                acpi_handle handle = DEVICE_ACPI_HANDLE(&(dev->dev));
-                if (handle)
-                        status = acpi_run_oshp(handle);
+                status = acpi_run_oshp(handle);
         }
         if (ACPI_FAILURE(status)) {
                 err("Cannot get control of hotplug hardware\n");