HID: hid-sony.c: Use devm_ api to simplify sony_leds_init()

[PATCH 3/5] HID: hid-sony.c: Use devm_ api to simplify sony_leds_init()

Using devm_ calls, the resources of the Sony game devices's features are
tied to the main device handle, making it easier to handle errors and
teardown inside the device driver. Altogether, this reduces complexity
of the driver source.

Signed-off-by: Hanno Zulla <kontakt@hanno.de>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-sony.c

@@ -1940,25 +1940,6 @@ static int sony_led_blink_set(struct led_classdev *led, unsigned long *delay_on,
 	return 0;
 }
 
-static void sony_leds_remove(struct sony_sc *sc)
-{
-	struct led_classdev *led;
-	int n;
-
-	BUG_ON(!(sc->quirks & SONY_LED_SUPPORT));
-
-	for (n = 0; n < sc->led_count; n++) {
-		led = sc->leds[n];
-		sc->leds[n] = NULL;
-		if (!led)
-			continue;
-		led_classdev_unregister(led);
-		kfree(led);
-	}
-
-	sc->led_count = 0;
-}
-
 static int sony_leds_init(struct sony_sc *sc)
 {
 	struct hid_device *hdev = sc->hdev;
@@ -2031,11 +2012,10 @@ static int sony_leds_init(struct sony_sc *sc)
 		if (use_ds4_names)
 			name_sz = strlen(dev_name(&hdev->dev)) + strlen(ds4_name_str[n]) + 2;
 
-		led = kzalloc(sizeof(struct led_classdev) + name_sz, GFP_KERNEL);
+		led = devm_kzalloc(&hdev->dev, sizeof(struct led_classdev) + name_sz, GFP_KERNEL);
 		if (!led) {
 			hid_err(hdev, "Couldn't allocate memory for LED %d\n", n);
-			ret = -ENOMEM;
-			goto error_leds;
+			return -ENOMEM;
 		}
 
 		name = (void *)(&led[1]);
@@ -2056,21 +2036,14 @@ static int sony_leds_init(struct sony_sc *sc)
 
 		sc->leds[n] = led;
 
-		ret = led_classdev_register(&hdev->dev, led);
+		ret = devm_led_classdev_register(&hdev->dev, led);
 		if (ret) {
 			hid_err(hdev, "Failed to register LED %d\n", n);
-			sc->leds[n] = NULL;
-			kfree(led);
-			goto error_leds;
+			return ret;
 		}
 	}
 
-	return ret;
-
-error_leds:
-	sony_leds_remove(sc);
-
-	return ret;
+	return 0;
 }
 
 static void sixaxis_send_output_report(struct sony_sc *sc)
@@ -2832,8 +2805,6 @@ err_stop:
 		device_remove_file(&sc->hdev->dev, &dev_attr_firmware_version);
 	if (sc->hw_version)
 		device_remove_file(&sc->hdev->dev, &dev_attr_hardware_version);
-	if (sc->quirks & SONY_LED_SUPPORT)
-		sony_leds_remove(sc);
 	if (sc->quirks & SONY_BATTERY_SUPPORT)
 		sony_battery_remove(sc);
 	sony_cancel_work_sync(sc);
@@ -2914,9 +2885,6 @@ static void sony_remove(struct hid_device *hdev)
 
 	hid_hw_close(hdev);
 
-	if (sc->quirks & SONY_LED_SUPPORT)
-		sony_leds_remove(sc);
-
 	if (sc->quirks & SONY_BATTERY_SUPPORT)
 		sony_battery_remove(sc);