ACPI: Unify the parsing of address_space and ext_address_space

With the unions in place which let us identify the substructs we can
use a single parser for address_space and ext_address_space.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/resource.c

@@ -178,6 +178,35 @@ bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
 }
 EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
 
+static bool acpi_decode_space(struct resource *res,
+			      struct acpi_resource_address *addr,
+			      struct acpi_address64_attribute *attr)
+{
+	u8 iodec = attr->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16;
+	bool window = addr->producer_consumer == ACPI_PRODUCER;
+	bool wp = addr->info.mem.write_protect;
+	u64 len = attr->address_length;
+
+	res->start = attr->minimum;
+	res->end = attr->maximum;
+
+	switch (addr->resource_type) {
+	case ACPI_MEMORY_RANGE:
+		acpi_dev_memresource_flags(res, len, wp, window);
+		break;
+	case ACPI_IO_RANGE:
+		acpi_dev_ioresource_flags(res, len, iodec, window);
+		break;
+	case ACPI_BUS_NUMBER_RANGE:
+		res->flags = IORESOURCE_BUS;
+		break;
+	default:
+		return false;
+	}
+
+	return !(res->flags & IORESOURCE_DISABLED);
+}
+
 /**
  * acpi_dev_resource_address_space - Extract ACPI address space information.
  * @ares: Input ACPI resource object.
@@ -190,39 +219,13 @@ EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
 bool acpi_dev_resource_address_space(struct acpi_resource *ares,
 				     struct resource *res)
 {
-	acpi_status status;
 	struct acpi_resource_address64 addr;
-	bool window;
-	u8 io_decode;
-
-	status = acpi_resource_to_address64(ares, &addr);
-	if (ACPI_FAILURE(status))
-		return false;
 
-	res->start = addr.address.minimum;
-	res->end = addr.address.maximum;
-	window = addr.producer_consumer == ACPI_PRODUCER;
-
-	switch(addr.resource_type) {
-	case ACPI_MEMORY_RANGE:
-		acpi_dev_memresource_flags(res, addr.address.address_length,
-					   addr.info.mem.write_protect,
-					   window);
-		break;
-	case ACPI_IO_RANGE:
-		io_decode = addr.address.granularity == 0xfff ?
-				ACPI_DECODE_10 : ACPI_DECODE_16;
-		acpi_dev_ioresource_flags(res, addr.address.address_length,
-					  io_decode, window);
-		break;
-	case ACPI_BUS_NUMBER_RANGE:
-		res->flags = IORESOURCE_BUS;
-		break;
-	default:
+	if (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr)))
 		return false;
-	}
 
-	return !(res->flags & IORESOURCE_DISABLED);
+	return acpi_decode_space(res, (struct acpi_resource_address *)&addr,
+				 &addr.address);
 }
 EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
 
@@ -239,39 +242,14 @@ bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
 					 struct resource *res)
 {
 	struct acpi_resource_extended_address64 *ext_addr;
-	bool window;
-	u8 io_decode;
 
 	if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
 		return false;
 
 	ext_addr = &ares->data.ext_address64;
 
-	res->start = ext_addr->address.minimum;
-	res->end = ext_addr->address.maximum;
-	window = ext_addr->producer_consumer == ACPI_PRODUCER;
-
-	switch(ext_addr->resource_type) {
-	case ACPI_MEMORY_RANGE:
-		acpi_dev_memresource_flags(res,
-					   ext_addr->address.address_length,
-					   ext_addr->info.mem.write_protect,
-					   window);
-		break;
-	case ACPI_IO_RANGE:
-		io_decode = ext_addr->address.granularity == 0xfff ?
-				ACPI_DECODE_10 : ACPI_DECODE_16;
-		acpi_dev_ioresource_flags(res, ext_addr->address.address_length,
-					  io_decode, window);
-		break;
-	case ACPI_BUS_NUMBER_RANGE:
-		res->flags = IORESOURCE_BUS;
-		break;
-	default:
-		return false;
-	}
-
-	return !(res->flags & IORESOURCE_DISABLED);
+	return acpi_decode_space(res, (struct acpi_resource_address *)ext_addr,
+				 &ext_addr->address);
 }
 EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);