platform: x86: Deletion of checks before backlight_device_unregister()

The backlight_device_unregister() function tests whether its argument is NULL
and then returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
For msi-wmi.c:
Acked-by: Anisse Astier <anisse@astier.eu>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

9 files changed, 10 insertions, 20 deletions

diff --git a/drivers/platform/x86/asus-laptop.c b/drivers/platform/x86/asus-laptop.c
index 7f4dc6f51f8a..11fac1a3977a 100644
--- a/drivers/platform/x86/asus-laptop.c
+++ b/drivers/platform/x86/asus-laptop.c
@@ -843,8 +843,7 @@ static int asus_backlight_init(struct asus_laptop *asus)
 
 static void asus_backlight_exit(struct asus_laptop *asus)
 {
-        if (asus->backlight_device)
-                backlight_device_unregister(asus->backlight_device);
+        backlight_device_unregister(asus->backlight_device);
         asus->backlight_device = NULL;
 }
 
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 21fc932da3a1..7543a56e0f45 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -1308,8 +1308,7 @@ static int asus_wmi_backlight_init(struct asus_wmi *asus)
 
 static void asus_wmi_backlight_exit(struct asus_wmi *asus)
 {
-        if (asus->backlight_device)
-                backlight_device_unregister(asus->backlight_device);
+        backlight_device_unregister(asus->backlight_device);
 
         asus->backlight_device = NULL;
 }
diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
index e4094b40a282..e5d50aa1e40f 100644
--- a/drivers/platform/x86/eeepc-laptop.c
+++ b/drivers/platform/x86/eeepc-laptop.c
@@ -1174,8 +1174,7 @@ static int eeepc_backlight_init(struct eeepc_laptop *eeepc)
 
 static void eeepc_backlight_exit(struct eeepc_laptop *eeepc)
 {
-        if (eeepc->backlight_device)
-                backlight_device_unregister(eeepc->backlight_device);
+        backlight_device_unregister(eeepc->backlight_device);
         eeepc->backlight_device = NULL;
 }
 
diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index 2655d4a988f3..460715dcf7db 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -1154,8 +1154,7 @@ fail_hotkey1:
 fail_hotkey:
         platform_driver_unregister(&fujitsupf_driver);
 fail_backlight:
-        if (fujitsu->bl_device)
-                backlight_device_unregister(fujitsu->bl_device);
+        backlight_device_unregister(fujitsu->bl_device);
 fail_sysfs_group:
         sysfs_remove_group(&fujitsu->pf_device->dev.kobj,
                            &fujitsupf_attribute_group);
@@ -1179,8 +1178,7 @@ static void __exit fujitsu_cleanup(void)
 
         platform_driver_unregister(&fujitsupf_driver);
 
-        if (fujitsu->bl_device)
-                backlight_device_unregister(fujitsu->bl_device);
+        backlight_device_unregister(fujitsu->bl_device);
 
         sysfs_remove_group(&fujitsu->pf_device->dev.kobj,
                            &fujitsupf_attribute_group);
diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index ed494f37c40f..31630612dd80 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -729,8 +729,7 @@ static int ideapad_backlight_init(struct ideapad_private *priv)
 
 static void ideapad_backlight_exit(struct ideapad_private *priv)
 {
-        if (priv->blightdev)
-                backlight_device_unregister(priv->blightdev);
+        backlight_device_unregister(priv->blightdev);
         priv->blightdev = NULL;
 }
 
diff --git a/drivers/platform/x86/intel_oaktrail.c b/drivers/platform/x86/intel_oaktrail.c
index 4bc960416785..0dd72cfb4426 100644
--- a/drivers/platform/x86/intel_oaktrail.c
+++ b/drivers/platform/x86/intel_oaktrail.c
@@ -271,8 +271,7 @@ static int oaktrail_backlight_init(void)
 
 static void oaktrail_backlight_exit(void)
 {
-        if (oaktrail_bl_device)
-                backlight_device_unregister(oaktrail_bl_device);
+        backlight_device_unregister(oaktrail_bl_device);
 }
 
 static int oaktrail_probe(struct platform_device *pdev)
diff --git a/drivers/platform/x86/msi-wmi.c b/drivers/platform/x86/msi-wmi.c
index 70222f265f68..6d2bac0c463c 100644
--- a/drivers/platform/x86/msi-wmi.c
+++ b/drivers/platform/x86/msi-wmi.c
@@ -354,8 +354,7 @@ static void __exit msi_wmi_exit(void)
                 sparse_keymap_free(msi_wmi_input_dev);
                 input_unregister_device(msi_wmi_input_dev);
         }
-        if (backlight)
-                backlight_device_unregister(backlight);
+        backlight_device_unregister(backlight);
 }
 
 module_init(msi_wmi_init);
diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 26ad9ff12ac5..a48cdc77f182 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -3141,8 +3141,7 @@ static void sony_nc_backlight_setup(void)
 
 static void sony_nc_backlight_cleanup(void)
 {
-        if (sony_bl_props.dev)
-                backlight_device_unregister(sony_bl_props.dev);
+        backlight_device_unregister(sony_bl_props.dev);
 }
 
 static int sony_nc_add(struct acpi_device *device)
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 06362b7d3ad7..a3294690df37 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -1797,8 +1797,7 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
                 rfkill_destroy(dev->bt_rfk);
         }
 
-        if (dev->backlight_dev)
-                backlight_device_unregister(dev->backlight_dev);
+        backlight_device_unregister(dev->backlight_dev);
 
         if (dev->illumination_supported)
                 led_classdev_unregister(&dev->led_dev);