sony_acpi: Fix sony_acpi backlight registration and unregistration

Initialize the current brightness if the driver registration
was successful and unregister the driver in the error exit path.

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/acpi/sony_acpi.c b/drivers/acpi/sony_acpi.c
index c65f5893e0e2..c01d98db2fc1 100644
--- a/drivers/acpi/sony_acpi.c
+++ b/drivers/acpi/sony_acpi.c
@@ -354,9 +354,14 @@ static int sony_acpi_add(struct acpi_device *device)
         if (ACPI_SUCCESS(acpi_get_handle(sony_acpi_handle, "GBRT", &handle))) {
                 sony_backlight_device = backlight_device_register("sony", NULL,
                                         NULL, &sony_backlight_properties);
+
                 if (IS_ERR(sony_backlight_device)) {
                         printk(LOG_PFX "unable to register backlight device\n");
+                        sony_backlight_device = NULL;
                 }
+                else
+                        sony_backlight_properties.brightness =
+                                sony_backlight_get_brightness(sony_backlight_device);
         }
 
         for (item = sony_acpi_values; item->name; ++item) {
@@ -400,6 +405,9 @@ static int sony_acpi_add(struct acpi_device *device)
         return 0;
 
 outproc:
+        if (sony_backlight_device)
+                backlight_device_unregister(sony_backlight_device);
+
         for (item = sony_acpi_values; item->name; ++item)
                 if (item->proc)
                         remove_proc_entry(item->name, acpi_device_dir(device));