diff options
Diffstat (limited to 'drivers/pci/hotplug/acpi_pcihp.c')
| -rw-r--r-- | drivers/pci/hotplug/acpi_pcihp.c | 38 |
1 files changed, 26 insertions, 12 deletions
diff --git a/drivers/pci/hotplug/acpi_pcihp.c b/drivers/pci/hotplug/acpi_pcihp.c index 93e37f0666a..e17ef54f0ef 100644 --- a/drivers/pci/hotplug/acpi_pcihp.c +++ b/drivers/pci/hotplug/acpi_pcihp.c @@ -382,7 +382,7 @@ EXPORT_SYMBOL_GPL(acpi_get_hp_params_from_firmware); int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags) { acpi_status status; - acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev)); + acpi_handle chandle, handle; struct pci_dev *pdev = dev; struct pci_bus *parent; struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; @@ -399,10 +399,25 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags) * Per PCI firmware specification, we should run the ACPI _OSC * method to get control of hotplug hardware before using it. If * an _OSC is missing, we look for an OSHP to do the same thing. - * To handle different BIOS behavior, we look for _OSC and OSHP - * within the scope of the hotplug controller and its parents, + * To handle different BIOS behavior, we look for _OSC on a root + * bridge preferentially (according to PCI fw spec). Later for + * OSHP within the scope of the hotplug controller and its parents, * upto the host bridge under which this controller exists. */ + handle = acpi_find_root_bridge_handle(pdev); + if (handle) { + acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); + dbg("Trying to get hotplug control for %s\n", + (char *)string.pointer); + status = pci_osc_control_set(handle, flags); + if (ACPI_SUCCESS(status)) + goto got_one; + kfree(string.pointer); + string = (struct acpi_buffer){ ACPI_ALLOCATE_BUFFER, NULL }; + } + + pdev = dev; + handle = DEVICE_ACPI_HANDLE(&dev->dev); while (!handle) { /* * This hotplug controller was not listed in the ACPI name @@ -427,15 +442,9 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags) acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); dbg("Trying to get hotplug control for %s \n", (char *)string.pointer); - status = pci_osc_control_set(handle, flags); - if (status == AE_NOT_FOUND) - status = acpi_run_oshp(handle); - if (ACPI_SUCCESS(status)) { - dbg("Gained control for hotplug HW for pci %s (%s)\n", - pci_name(dev), (char *)string.pointer); - kfree(string.pointer); - return 0; - } + status = acpi_run_oshp(handle); + if (ACPI_SUCCESS(status)) + goto got_one; if (acpi_root_bridge(handle)) break; chandle = handle; @@ -449,6 +458,11 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags) kfree(string.pointer); return -ENODEV; +got_one: + dbg("Gained control for hotplug HW for pci %s (%s)\n", pci_name(dev), + (char *)string.pointer); + kfree(string.pointer); + return 0; } EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware); |