linux-kernel - [PATCH 1/4] leds: pwm: Simplify with resource-managed devm_led_classdev

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Date:   Fri,  7 Dec 2018 13:32:51 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Baolin Wang <baolin.wang@...aro.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Raphael Teysseyre <rteysseyre@...il.com>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] leds: pwm: Simplify with resource-managed devm_led_classdev_register()

Simplify the exit path with resource-managed version of registering LED
class device.  The code should be functionally the same, except that on
device removal the led_pwm_priv->num_leds is not decremented to zero
(which should not have any effect as device is going away).

Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
---
 drivers/leds/leds-pwm.c | 22 ++--------------------
 1 file changed, 2 insertions(+), 20 deletions(-)

diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c
index 5d3faae51d59..fcb3e87a9887 100644
--- a/drivers/leds/leds-pwm.c
+++ b/drivers/leds/leds-pwm.c
@@ -74,12 +74,6 @@ static inline size_t sizeof_pwm_leds_priv(int num_leds)
 		      (sizeof(struct led_pwm_data) * num_leds);
 }
 
-static void led_pwm_cleanup(struct led_pwm_priv *priv)
-{
-	while (priv->num_leds--)
-		led_classdev_unregister(&priv->leds[priv->num_leds].cdev);
-}
-
 static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
 		       struct led_pwm *led, struct device_node *child)
 {
@@ -120,7 +114,7 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
 	if (!led_data->period && (led->pwm_period_ns > 0))
 		led_data->period = led->pwm_period_ns;
 
-	ret = led_classdev_register(dev, &led_data->cdev);
+	ret = devm_led_classdev_register(dev, &led_data->cdev);
 	if (ret == 0) {
 		priv->num_leds++;
 		led_pwm_set(&led_data->cdev, led_data->cdev.brightness);
@@ -191,25 +185,14 @@ static int led_pwm_probe(struct platform_device *pdev)
 		ret = led_pwm_create_of(&pdev->dev, priv);
 	}
 
-	if (ret) {
-		led_pwm_cleanup(priv);
+	if (ret)
 		return ret;
-	}
 
 	platform_set_drvdata(pdev, priv);
 
 	return 0;
 }
 
-static int led_pwm_remove(struct platform_device *pdev)
-{
-	struct led_pwm_priv *priv = platform_get_drvdata(pdev);
-
-	led_pwm_cleanup(priv);
-
-	return 0;
-}
-
 static const struct of_device_id of_pwm_leds_match[] = {
 	{ .compatible = "pwm-leds", },
 	{},
@@ -218,7 +201,6 @@ MODULE_DEVICE_TABLE(of, of_pwm_leds_match);
 
 static struct platform_driver led_pwm_driver = {
 	.probe		= led_pwm_probe,
-	.remove		= led_pwm_remove,
 	.driver		= {
 		.name	= "leds_pwm",
 		.of_match_table = of_pwm_leds_match,
-- 
2.7.4