1 files changed, 30 insertions, 23 deletions

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 42179256264..99a3a28594d 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -253,31 +253,21 @@ static int acpi_processor_errata(struct acpi_processor *pr)
  * _PDC is required for a BIOS-OS handshake for most of the newer
  * ACPI processor features.
  */
-
-int acpi_processor_set_pdc(struct acpi_processor *pr,
-			   struct acpi_object_list *pdc_in)
+static int acpi_processor_set_pdc(struct acpi_processor *pr)
 {
+	struct acpi_object_list *pdc_in = pr->pdc;
 	acpi_status status = AE_OK;
-	u32 arg0_buf[3];
-	union acpi_object arg0 = { ACPI_TYPE_BUFFER };
-	struct acpi_object_list no_object = { 1, &arg0 };
-	struct acpi_object_list *pdc;
 
 	ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
 
-	arg0.buffer.length = 12;
-	arg0.buffer.pointer = (u8 *) arg0_buf;
-	arg0_buf[0] = ACPI_PDC_REVISION_ID;
-	arg0_buf[1] = 0;
-	arg0_buf[2] = 0;
-
-	pdc = (pdc_in) ? pdc_in : &no_object;
+	if (!pdc_in)
+		return_VALUE(status);
 
-	status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
+	status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
 
-	if ((ACPI_FAILURE(status)) && (pdc_in))
+	if (ACPI_FAILURE(status))
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-				  "Error evaluating _PDC, using legacy perf. control...\n"));
+		    "Could not evaluate _PDC, using legacy perf. control...\n"));
 
 	return_VALUE(status);
 }
@@ -357,7 +347,6 @@ static int acpi_processor_add_fs(struct acpi_device *device)
 				  ACPI_PROCESSOR_FILE_THROTTLING));
 	else {
 		entry->proc_fops = &acpi_processor_throttling_fops;
-		entry->proc_fops->write = acpi_processor_write_throttling;
 		entry->data = acpi_driver_data(device);
 		entry->owner = THIS_MODULE;
 	}
@@ -372,7 +361,6 @@ static int acpi_processor_add_fs(struct acpi_device *device)
 				  ACPI_PROCESSOR_FILE_LIMIT));
 	else {
 		entry->proc_fops = &acpi_processor_limit_fops;
-		entry->proc_fops->write = acpi_processor_write_limit;
 		entry->data = acpi_driver_data(device);
 		entry->owner = THIS_MODULE;
 	}
@@ -543,6 +531,8 @@ static int acpi_processor_get_info(struct acpi_processor *pr)
 	return_VALUE(0);
 }
 
+static void *processor_device_array[NR_CPUS];
+
 static int acpi_processor_start(struct acpi_device *device)
 {
 	int result = 0;
@@ -561,6 +551,19 @@ static int acpi_processor_start(struct acpi_device *device)
 
 	BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 
+	/*
+	 * Buggy BIOS check
+	 * ACPI id of processors can be reported wrongly by the BIOS.
+	 * Don't trust it blindly
+	 */
+	if (processor_device_array[pr->id] != NULL &&
+	    processor_device_array[pr->id] != (void *)device) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "BIOS reporting wrong ACPI id"
+			"for the processor\n"));
+		return_VALUE(-ENODEV);
+	}
+	processor_device_array[pr->id] = (void *)device;
+
 	processors[pr->id] = pr;
 
 	result = acpi_processor_add_fs(device);
@@ -574,6 +577,10 @@ static int acpi_processor_start(struct acpi_device *device)
 				  "Error installing device notify handler\n"));
 	}
 
+	/* _PDC call should be done before doing anything else (if reqd.). */
+	arch_acpi_processor_init_pdc(pr);
+	acpi_processor_set_pdc(pr);
+
 	acpi_processor_power_init(pr, device);
 
 	if (pr->flags.throttling) {
@@ -733,7 +740,7 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
 		return_VALUE(-ENODEV);
 
 	if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
-		kobject_hotplug(&(*device)->kobj, KOBJ_ONLINE);
+		kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
 	}
 	return_VALUE(0);
 }
@@ -773,13 +780,13 @@ acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 		}
 
 		if (pr->id >= 0 && (pr->id < NR_CPUS)) {
-			kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
+			kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 			break;
 		}
 
 		result = acpi_processor_start(device);
 		if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
-			kobject_hotplug(&device->kobj, KOBJ_ONLINE);
+			kobject_uevent(&device->kobj, KOBJ_ONLINE);
 		} else {
 			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 					  "Device [%s] failed to start\n",
@@ -803,7 +810,7 @@ acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
 		}
 
 		if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
-			kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
+			kobject_uevent(&device->kobj, KOBJ_OFFLINE);
 		break;
 	default:
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,