Currently, all the _OSC controls are queried at the same time in
acpi_pci_osc_support() and the result is preserved for later
acpi_pci_osc_control_set() call. But query result can vary depending
on the combination of requested controls. Therefore, query result must
not be preserved.
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
---
drivers/acpi/pci_root.c | 49 ++++++++++++++++++++++++++----------------------
include/acpi/acpi_bus.h | 3 --
2 files changed, 27 insertions(+), 25 deletions(-)
Index: linux-2.6.35-rc6/drivers/acpi/pci_root.c
===================================================================
--- linux-2.6.35-rc6.orig/drivers/acpi/pci_root.c
+++ linux-2.6.35-rc6/drivers/acpi/pci_root.c
@@ -230,35 +230,42 @@ static acpi_status acpi_pci_run_osc(acpi
return status;
}
-static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
+static acpi_status acpi_pci_osc_control_query(struct acpi_pci_root *root,
+ u32 flags, u32 *result)
{
- acpi_status status;
- u32 result;
-
- /* do _OSC query for all possible controls */
- flags &= OSC_PCI_SUPPORT_MASKS;
- status = acpi_pci_run_osc(root->device->handle,
- root->osc_support_set | flags,
- OSC_PCI_CONTROL_MASKS,
- true, &result);
- if (ACPI_SUCCESS(status)) {
- root->osc_support_set |= flags;
- root->osc_control_qry = result;
- root->osc_queried = 1;
+ /* No need to run _OSC if requested control bits are already granted */
+ flags &= OSC_PCI_CONTROL_MASKS;
+ if ((root->osc_control_set & flags) == flags) {
+ *result = root->osc_control_set;
+ return AE_OK;
}
- return status;
+ return acpi_pci_run_osc(root->device->handle,
+ root->osc_support_set,
+ root->osc_control_set | flags,
+ true, result);
}
static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
{
acpi_status status;
acpi_handle tmp;
+ u32 result;
status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
if (ACPI_FAILURE(status))
return status;
mutex_lock(&osc_lock);
- status = acpi_pci_query_osc(root, flags);
+ /* No need to run _OSC if requested support bits are already set */
+ flags &= OSC_PCI_SUPPORT_MASKS;
+ if ((root->osc_support_set & flags) == flags)
+ goto out;
+ status = acpi_pci_run_osc(root->device->handle,
+ root->osc_support_set | flags,
+ root->osc_control_set,
+ true, &result);
+ if (ACPI_SUCCESS(status))
+ root->osc_support_set |= flags;
+out:
mutex_unlock(&osc_lock);
return status;
}
@@ -399,12 +406,10 @@ acpi_status acpi_pci_osc_control_set(acp
goto out;
/* Need to query controls first before requesting them */
- if (!root->osc_queried) {
- status = acpi_pci_query_osc(root, root->osc_support_set);
- if (ACPI_FAILURE(status))
- goto out;
- }
- if ((root->osc_control_qry & control_req) != control_req) {
+ status = acpi_pci_osc_control_query(root, control_req, &result);
+ if (ACPI_FAILURE(status))
+ goto out;
+ if ((result & control_req) != control_req) {
printk(KERN_DEBUG
"Firmware did not grant requested _OSC control\n");
status = AE_SUPPORT;
Index: linux-2.6.35-rc6/include/acpi/acpi_bus.h
===================================================================
--- linux-2.6.35-rc6.orig/include/acpi/acpi_bus.h
+++ linux-2.6.35-rc6/include/acpi/acpi_bus.h
@@ -377,9 +377,6 @@ struct acpi_pci_root {
u32 osc_support_set; /* _OSC state of support bits */
u32 osc_control_set; /* _OSC state of control bits */
- u32 osc_control_qry; /* the latest _OSC query result */
-
- u32 osc_queried:1; /* has _OSC control been queried? */
};
/* helper */
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