3 files changed, 18 insertions, 2 deletions

diff --git a/drivers/acpi/acpica/exstorob.c b/drivers/acpi/acpica/exstorob.c
index 67340cc70142..257706e7734f 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/video.c b/drivers/acpi/video.c
index 8851315ce858..60ea984c84a0 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");
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 81d31ea507d1..51c0a8bee414 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -335,6 +335,7 @@ static void bt_rfkill_poll(struct rfkill *rfkill, void *data)
         if (hci_result != HCI_SUCCESS) {
                 /* Can't do anything useful */
                 mutex_unlock(&dev->mutex);
+                return;
         }
 
         new_rfk_state = value;