ACPI: Revert a change that allowed P_BLK lengths to be 4 or 5. This is causing

us to think that some systems support C2 when they really don't.

drivers/acpi/processor.c

@@ -1616,19 +1616,15 @@ acpi_processor_get_info (
 
 	if (!object.processor.pblk_address)
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
-	else if (object.processor.pblk_length < 4)
+	else if (object.processor.pblk_length != 6)
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n",
 			object.processor.pblk_length));
 	else {
 		pr->throttling.address = object.processor.pblk_address;
 		pr->throttling.duty_offset = acpi_fadt.duty_offset;
 		pr->throttling.duty_width = acpi_fadt.duty_width;
-
-		if (object.processor.pblk_length >= 5)
 		pr->power.states[ACPI_STATE_C2].address =
 			object.processor.pblk_address + 4;
-
-		if (object.processor.pblk_length >= 6)
 		pr->power.states[ACPI_STATE_C3].address =
 			object.processor.pblk_address + 5;
 	}