3 files changed, 20 insertions, 4 deletions

diff --git a/drivers/acpi/acpica/exstorob.c b/drivers/acpi/acpica/exstorob.c
index 67340cc7014..257706e7734 100644
--- a/drivers/acpi/acpica/exstorob.c
+++ b/drivers/acpi/acpica/exstorob.c
@@ -70,6 +70,12 @@ acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
 
         ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc);
 
+        /* If Source and Target are the same, just return */
+
+        if (source_desc == target_desc) {
+                return_ACPI_STATUS(AE_OK);
+        }
+
         /* We know that source_desc is a buffer by now */
 
         buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);
@@ -161,6 +167,12 @@ acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
 
         ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc);
 
+        /* If Source and Target are the same, just return */
+
+        if (source_desc == target_desc) {
+                return_ACPI_STATUS(AE_OK);
+        }
+
         /* We know that source_desc is a string by now */
 
         buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);
diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
index f6baa77deef..0c4ca4d318b 100644
--- a/drivers/acpi/blacklist.c
+++ b/drivers/acpi/blacklist.c
@@ -78,9 +78,10 @@ static struct acpi_blacklist_item acpi_blacklist[] __initdata = {
 
 static int __init blacklist_by_year(void)
 {
-        int year = dmi_get_year(DMI_BIOS_DATE);
+        int year;
+
         /* Doesn't exist? Likely an old system */
-        if (year == -1) {
+        if (!dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL)) {
                 printk(KERN_ERR PREFIX "no DMI BIOS year, "
                         "acpi=force is required to enable ACPI\n" );
                 return 1;
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 8851315ce85..60ea984c84a 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -2004,8 +2004,11 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
         status = acpi_remove_notify_handler(device->dev->handle,
                                             ACPI_DEVICE_NOTIFY,
                                             acpi_video_device_notify);
-        sysfs_remove_link(&device->backlight->dev.kobj, "device");
-        backlight_device_unregister(device->backlight);
+        if (device->backlight) {
+                sysfs_remove_link(&device->backlight->dev.kobj, "device");
+                backlight_device_unregister(device->backlight);
+                device->backlight = NULL;
+        }
         if (device->cdev) {
                 sysfs_remove_link(&device->dev->dev.kobj,
                                   "thermal_cooling");