diff --git a/drivers/acpi/acpica/utmutex.c b/drivers/acpi/acpica/utmutex.c
index 058b3df..f5cca3a 100644
--- a/drivers/acpi/acpica/utmutex.c
+++ b/drivers/acpi/acpica/utmutex.c
@@ -279,13 +279,10 @@
 
 acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
 {
-	acpi_thread_id this_thread_id;
-
 	ACPI_FUNCTION_NAME(ut_release_mutex);
 
-	this_thread_id = acpi_os_get_thread_id();
 	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %p releasing Mutex [%s]\n",
-			  ACPI_CAST_PTR(void, this_thread_id),
+			  ACPI_CAST_PTR(void, acpi_os_get_thread_id()),
 			  acpi_ut_get_mutex_name(mutex_id)));
 
 	if (mutex_id > ACPI_MAX_MUTEX) {
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index b0337d3..5718566 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -255,12 +255,10 @@
 
 static int __init acpi_parse_srat(struct acpi_table_header *table)
 {
-	struct acpi_table_srat *srat;
-
 	if (!table)
 		return -EINVAL;
 
-	srat = (struct acpi_table_srat *)table;
+	/* Real work done in acpi_table_parse_srat below. */
 
 	return 0;
 }
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 44bddc5..03017b1 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -141,15 +141,14 @@
 static void __init acpi_request_region (struct acpi_generic_address *addr,
 	unsigned int length, char *desc)
 {
-	struct resource *res;
-
 	if (!addr->address || !length)
 		return;
 
+	/* Resources are never freed */
 	if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
-		res = request_region(addr->address, length, desc);
+		request_region(addr->address, length, desc);
 	else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
-		res = request_mem_region(addr->address, length, desc);
+		request_mem_region(addr->address, length, desc);
 }
 
 static int __init acpi_reserve_resources(void)
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 4fe5018..cf073aa 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -242,8 +242,6 @@
 	acpi_status status = AE_OK;
 	struct acpi_power_resource *resource = NULL;
 	struct list_head *node, *next;
-	struct acpi_power_reference *ref;
-
 
 	result = acpi_power_get_context(handle, &resource);
 	if (result)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 5cbc0cb..07bc74d 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -722,13 +722,12 @@
 	} else if (cx->entry_method == ACPI_CSTATE_HALT) {
 		acpi_safe_halt();
 	} else {
-		int unused;
 		/* IO port based C-state */
 		inb(cx->address);
 		/* Dummy wait op - must do something useless after P_LVL2 read
 		   because chipsets cannot guarantee that STPCLK# signal
 		   gets asserted in time to freeze execution properly. */
-		unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
+		inl(acpi_gbl_FADT.xpm_timer_block.address);
 	}
 	start_critical_timings();
 }
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 909ae7b..67dec0c 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -2167,7 +2167,7 @@
 		status = acpi_video_bus_get_one_device(dev, video);
 		if (ACPI_FAILURE(status)) {
 			printk(KERN_WARNING PREFIX
-					"Cant attach device");
+					"Cant attach device\n");
 			continue;
 		}
 	}
@@ -2177,19 +2177,19 @@
 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
 {
 	acpi_status status;
-	struct acpi_video_bus *video;
-
 
 	if (!device || !device->video)
 		return -ENOENT;
 
-	video = device->video;
-
 	acpi_video_device_remove_fs(device->dev);
 
 	status = acpi_remove_notify_handler(device->dev->handle,
 					    ACPI_DEVICE_NOTIFY,
 					    acpi_video_device_notify);
+	if (ACPI_FAILURE(status)) {
+		printk(KERN_WARNING PREFIX
+		       "Cant remove video notify handler\n");
+	}
 	if (device->backlight) {
 		sysfs_remove_link(&device->backlight->dev.kobj, "device");
 		backlight_device_unregister(device->backlight);
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 7b5eea7..8b5ea39 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -145,12 +145,6 @@
 	struct ata_eh_info *ehi = &ap->link.eh_info;
 	int wait = 0;
 	unsigned long flags;
-	acpi_handle handle;
-
-	if (dev)
-		handle = dev->acpi_handle;
-	else
-		handle = ap->acpi_handle;
 
 	spin_lock_irqsave(ap->lock, flags);
 	/*