[PATCH v4 08/10] leds: mlxreg: use devm_mutex_init for mutex initializtion

[George Stark]

In this driver LEDs are registered using devm_led_classdev_register()
so they are automatically unregistered after module's remove() is done.
led_classdev_unregister() calls module's led_set_brightness() to turn off
the LEDs and that callback uses mutex which was destroyed already
in module's remove() so use devm API instead.

Signed-off-by: George Stark <gnstark@xxxxxxxxxxxxxxxxx>
---
 drivers/leds/leds-mlxreg.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/leds/leds-mlxreg.c b/drivers/leds/leds-mlxreg.c
index b7855c93bd72..64a78eff05c7 100644
--- a/drivers/leds/leds-mlxreg.c
+++ b/drivers/leds/leds-mlxreg.c
@@ -5,6 +5,7 @@
 
 #include <linux/bitops.h>
 #include <linux/device.h>
+#include <linux/devm-helpers.h>
 #include <linux/io.h>
 #include <linux/leds.h>
 #include <linux/module.h>
@@ -258,6 +259,7 @@ static int mlxreg_led_probe(struct platform_device *pdev)
 {
 	struct mlxreg_core_platform_data *led_pdata;
 	struct mlxreg_led_priv_data *priv;
+	int err;
 
 	led_pdata = dev_get_platdata(&pdev->dev);
 	if (!led_pdata) {
@@ -269,28 +271,21 @@ static int mlxreg_led_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	mutex_init(&priv->access_lock);
+	err = devm_mutex_init(&pdev->dev, &priv->access_lock);
+	if (err)
+		return err;
+
 	priv->pdev = pdev;
 	priv->pdata = led_pdata;
 
 	return mlxreg_led_config(priv);
 }
 
-static int mlxreg_led_remove(struct platform_device *pdev)
-{
-	struct mlxreg_led_priv_data *priv = dev_get_drvdata(&pdev->dev);
-
-	mutex_destroy(&priv->access_lock);
-
-	return 0;
-}
-
 static struct platform_driver mlxreg_led_driver = {
 	.driver = {
 	    .name = "leds-mlxreg",
 	},
 	.probe = mlxreg_led_probe,
-	.remove = mlxreg_led_remove,
 };
 
 module_platform_driver(mlxreg_led_driver);
-- 
2.25.1