Merge branch 'linus' into release

[linux-2.6-omap-h63xx.git] / drivers / pci / pci-acpi.c

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 8f923ee5177f788e0fa6553268447beb36362608..deea8a187eb86f6b81d423c2fae4e4859937764a 100644 (file)
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -13,8 +13,6 @@
 #include <linux/module.h>
 #include <linux/pci-aspm.h>
 #include <acpi/acpi.h>
-#include <acpi/acnamesp.h>
-#include <acpi/acresrc.h>
 #include <acpi/acpi_bus.h>
 
 #include <linux/pci-acpi.h>
@@ -24,13 +22,14 @@ struct acpi_osc_data {
        acpi_handle handle;
        u32 support_set;
        u32 control_set;
+       u32 control_query;
+       int is_queried;
        struct list_head sibiling;
 };
 static LIST_HEAD(acpi_osc_data_list);
 
 struct acpi_osc_args {
        u32 capbuf[3];
-       u32 ctrl_result;
 };
 
 static DEFINE_MUTEX(pci_acpi_lock);
@@ -56,7 +55,7 @@ static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
                          0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
 
 static acpi_status acpi_run_osc(acpi_handle handle,
-                               struct acpi_osc_args *osc_args)
+                               struct acpi_osc_args *osc_args, u32 *retval)
 {
        acpi_status status;
        struct acpi_object_list input;
@@ -112,8 +111,7 @@ static acpi_status acpi_run_osc(acpi_handle handle,
                goto out_kfree;
        }
 out_success:
-       osc_args->ctrl_result =
-               *((u32 *)(out_obj->buffer.pointer + 8));
+       *retval = *((u32 *)(out_obj->buffer.pointer + 8));
        status = AE_OK;
 
 out_kfree:
@@ -121,11 +119,10 @@ out_kfree:
        return status;
 }
 
-static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data,
-                                   u32 *result)
+static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data)
 {
        acpi_status status;
-       u32 support_set;
+       u32 support_set, result;
        struct acpi_osc_args osc_args;
 
        /* do _OSC query for all possible controls */
@@ -134,10 +131,11 @@ static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data,
        osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
        osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
 
-       status = acpi_run_osc(osc_data->handle, &osc_args);
+       status = acpi_run_osc(osc_data->handle, &osc_args, &result);
        if (ACPI_SUCCESS(status)) {
                osc_data->support_set = support_set;
-               *result = osc_args.ctrl_result;
+               osc_data->control_query = result;
+               osc_data->is_queried = 1;
        }
 
        return status;
@@ -151,7 +149,6 @@ static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data,
  */
 int pci_acpi_osc_support(acpi_handle handle, u32 flags)
 {
-       u32 dummy;
        acpi_status status;
        acpi_handle tmp;
        struct acpi_osc_data *osc_data;
@@ -169,7 +166,7 @@ int pci_acpi_osc_support(acpi_handle handle, u32 flags)
                goto out;
        }
 
-       __acpi_query_osc(flags, osc_data, &dummy);
+       __acpi_query_osc(flags, osc_data);
 out:
        mutex_unlock(&pci_acpi_lock);
        return rc;
@@ -185,7 +182,7 @@ out:
 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
 {
        acpi_status status;
-       u32 ctrlset, control_set, result;
+       u32 control_req, control_set, result;
        acpi_handle tmp;
        struct acpi_osc_data *osc_data;
        struct acpi_osc_args osc_args;
@@ -202,28 +199,34 @@ acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
                goto out;
        }
 
-       ctrlset = (flags & OSC_CONTROL_MASKS);
-       if (!ctrlset) {
+       control_req = (flags & OSC_CONTROL_MASKS);
+       if (!control_req) {
                status = AE_TYPE;
                goto out;
        }
 
-       status = __acpi_query_osc(osc_data->support_set, osc_data, &result);
-       if (ACPI_FAILURE(status))
+       /* No need to evaluate _OSC if the control was already granted. */
+       if ((osc_data->control_set & control_req) == control_req)
                goto out;
 
-       if ((result & ctrlset) != ctrlset) {
+       if (!osc_data->is_queried) {
+               status = __acpi_query_osc(osc_data->support_set, osc_data);
+               if (ACPI_FAILURE(status))
+                       goto out;
+       }
+
+       if ((osc_data->control_query & control_req) != control_req) {
                status = AE_SUPPORT;
                goto out;
        }
 
-       control_set = osc_data->control_set | ctrlset;
+       control_set = osc_data->control_set | control_req;
        osc_args.capbuf[OSC_QUERY_TYPE] = 0;
        osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
        osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
-       status = acpi_run_osc(handle, &osc_args);
+       status = acpi_run_osc(handle, &osc_args, &result);
        if (ACPI_SUCCESS(status))
-               osc_data->control_set = control_set;
+               osc_data->control_set = result;
 out:
        mutex_unlock(&pci_acpi_lock);
        return status;