From 0dcb2b7e722f62b886f28b01150860de67d219fa Mon Sep 17 00:00:00 2001 From: Kristen Carlson Accardi Date: Mon, 30 Oct 2006 13:08:12 -0800 Subject: [PATCH] pci: clear osc support flags if no _OSC method So it looks like pci aer code will call pci_osc_support_set to tell the firmware about OSC_EXT_PCI_CONFIG_SUPPORT flag. that causes ctrlset_buf[OSC_SUPPORT_TYPE] to evaluate to true when pciehp calls pci_osc_control_set() is called (to attempt to use OSC to gain native pcie control from firmware), regardless of whether or not _OSC was actually successfully executed. That causes this section of code: if (ctrlset_buf[OSC_SUPPORT_TYPE] && ((global_ctrlsets & ctrlset) != ctrlset)) { return AE_SUPPORT; } to be hit. This patch will reset the OSC_SUPPORT_TYPE field if _OSC fails, and then would allow pciehp to go ahead and try to run _OSC again. Signed-off-by: Kristen Carlson Accardi Signed-off-by: Greg Kroah-Hartman --- drivers/pci/pci-acpi.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index bb7456c1dbac..a064f36a0805 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -36,6 +36,7 @@ acpi_query_osc ( struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; union acpi_object *out_obj; u32 osc_dw0; + acpi_status *ret_status = (acpi_status *)retval; /* Setting up input parameters */ @@ -56,6 +57,7 @@ acpi_query_osc ( if (ACPI_FAILURE (status)) { printk(KERN_DEBUG "Evaluate _OSC Set fails. Status = 0x%04x\n", status); + *ret_status = status; return status; } out_obj = output.pointer; @@ -90,6 +92,7 @@ acpi_query_osc ( query_osc_out: kfree(output.pointer); + *ret_status = status; return status; } @@ -166,6 +169,7 @@ run_osc_out: acpi_status pci_osc_support_set(u32 flags) { u32 temp; + acpi_status retval; if (!(flags & OSC_SUPPORT_MASKS)) { return AE_TYPE; @@ -179,9 +183,13 @@ acpi_status pci_osc_support_set(u32 flags) acpi_get_devices ( PCI_ROOT_HID_STRING, acpi_query_osc, ctrlset_buf, - NULL ); + (void **) &retval ); ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE; ctrlset_buf[OSC_CONTROL_TYPE] = temp; + if (ACPI_FAILURE(retval)) { + /* no osc support at all */ + ctrlset_buf[OSC_SUPPORT_TYPE] = 0; + } return AE_OK; } EXPORT_SYMBOL(pci_osc_support_set); -- 2.30.2