diff --git a/drivers/acpi/motherboard.c b/drivers/acpi/motherboard.c
index 4682441..d51d68f 100644
--- a/drivers/acpi/motherboard.c
+++ b/drivers/acpi/motherboard.c
@@ -37,7 +37,7 @@
 #define ACPI_MB_HID2			"PNP0C02"
 /**
  * Doesn't care about legacy IO ports, only IO ports beyond 0x1000 are reserved
- * Doesn't care about the failure of 'request_region', since other may reserve 
+ * Doesn't care about the failure of 'request_region', since other may reserve
  * the io ports as well
  */
 #define IS_RESERVED_ADDR(base, len) \
@@ -46,7 +46,7 @@
 /*
  * Clearing the flag (IORESOURCE_BUSY) allows drivers to use
  * the io ports if they really know they can use it, while
- * still preventing hotplug PCI devices from using it. 
+ * still preventing hotplug PCI devices from using it.
  */
 static acpi_status acpi_reserve_io_ranges(struct acpi_resource *res, void *data)
 {
@@ -123,49 +123,54 @@
 		},
 };
 
+static void __init acpi_request_region (struct acpi_generic_address *addr,
+	unsigned int length, char *desc)
+{
+	if (!addr->address || !length)
+		return;
+
+	if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_IO)
+		request_region(addr->address, length, desc);
+	else if (addr->address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
+		request_mem_region(addr->address, length, desc);
+}
+
 static void __init acpi_reserve_resources(void)
 {
-	if (acpi_gbl_FADT->xpm1a_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
-		request_region(acpi_gbl_FADT->xpm1a_evt_blk.address,
-			       acpi_gbl_FADT->pm1_evt_len, "PM1a_EVT_BLK");
+	acpi_request_region(&acpi_gbl_FADT->xpm1a_evt_blk,
+			       acpi_gbl_FADT->pm1_evt_len, "ACPI PM1a_EVT_BLK");
 
-	if (acpi_gbl_FADT->xpm1b_evt_blk.address && acpi_gbl_FADT->pm1_evt_len)
-		request_region(acpi_gbl_FADT->xpm1b_evt_blk.address,
-			       acpi_gbl_FADT->pm1_evt_len, "PM1b_EVT_BLK");
+	acpi_request_region(&acpi_gbl_FADT->xpm1b_evt_blk,
+			       acpi_gbl_FADT->pm1_evt_len, "ACPI PM1b_EVT_BLK");
 
-	if (acpi_gbl_FADT->xpm1a_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
-		request_region(acpi_gbl_FADT->xpm1a_cnt_blk.address,
-			       acpi_gbl_FADT->pm1_cnt_len, "PM1a_CNT_BLK");
+	acpi_request_region(&acpi_gbl_FADT->xpm1a_cnt_blk,
+			       acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1a_CNT_BLK");
 
-	if (acpi_gbl_FADT->xpm1b_cnt_blk.address && acpi_gbl_FADT->pm1_cnt_len)
-		request_region(acpi_gbl_FADT->xpm1b_cnt_blk.address,
-			       acpi_gbl_FADT->pm1_cnt_len, "PM1b_CNT_BLK");
+	acpi_request_region(&acpi_gbl_FADT->xpm1b_cnt_blk,
+			       acpi_gbl_FADT->pm1_cnt_len, "ACPI PM1b_CNT_BLK");
 
-	if (acpi_gbl_FADT->xpm_tmr_blk.address && acpi_gbl_FADT->pm_tm_len == 4)
-		request_region(acpi_gbl_FADT->xpm_tmr_blk.address, 4, "PM_TMR");
+	if (acpi_gbl_FADT->pm_tm_len == 4)
+		acpi_request_region(&acpi_gbl_FADT->xpm_tmr_blk, 4, "ACPI PM_TMR");
 
-	if (acpi_gbl_FADT->xpm2_cnt_blk.address && acpi_gbl_FADT->pm2_cnt_len)
-		request_region(acpi_gbl_FADT->xpm2_cnt_blk.address,
-			       acpi_gbl_FADT->pm2_cnt_len, "PM2_CNT_BLK");
+	acpi_request_region(&acpi_gbl_FADT->xpm2_cnt_blk,
+			       acpi_gbl_FADT->pm2_cnt_len, "ACPI PM2_CNT_BLK");
 
 	/* Length of GPE blocks must be a non-negative multiple of 2 */
 
-	if (acpi_gbl_FADT->xgpe0_blk.address && acpi_gbl_FADT->gpe0_blk_len &&
-	    !(acpi_gbl_FADT->gpe0_blk_len & 0x1))
-		request_region(acpi_gbl_FADT->xgpe0_blk.address,
-			       acpi_gbl_FADT->gpe0_blk_len, "GPE0_BLK");
+	if (!(acpi_gbl_FADT->gpe0_blk_len & 0x1))
+		acpi_request_region(&acpi_gbl_FADT->xgpe0_blk,
+			       acpi_gbl_FADT->gpe0_blk_len, "ACPI GPE0_BLK");
 
-	if (acpi_gbl_FADT->xgpe1_blk.address && acpi_gbl_FADT->gpe1_blk_len &&
-	    !(acpi_gbl_FADT->gpe1_blk_len & 0x1))
-		request_region(acpi_gbl_FADT->xgpe1_blk.address,
-			       acpi_gbl_FADT->gpe1_blk_len, "GPE1_BLK");
+	if (!(acpi_gbl_FADT->gpe1_blk_len & 0x1))
+		acpi_request_region(&acpi_gbl_FADT->xgpe1_blk,
+			       acpi_gbl_FADT->gpe1_blk_len, "ACPI GPE1_BLK");
 }
 
 static int __init acpi_motherboard_init(void)
 {
 	acpi_bus_register_driver(&acpi_motherboard_driver1);
 	acpi_bus_register_driver(&acpi_motherboard_driver2);
-	/* 
+	/*
 	 * Guarantee motherboard IO reservation first
 	 * This module must run after scan.c
 	 */