[PATCH v3 05/11] leds: aw200xx: use devm API to cleanup module's resources

[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 resources which were destroyed already
in module's remove() so use devm API instead of remove().

Signed-off-by: George Stark <gnst...@salutedevices.com>
---
 drivers/leds/leds-aw200xx.c | 33 ++++++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c
index 1d3943f86f7f..eed1e65c1c0e 100644
--- a/drivers/leds/leds-aw200xx.c
+++ b/drivers/leds/leds-aw200xx.c
@@ -10,6 +10,7 @@
 #include <linux/bitfield.h>
 #include <linux/bits.h>
 #include <linux/container_of.h>
+#include <linux/devm-helpers.h>
 #include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/leds.h>
@@ -530,6 +531,16 @@ static const struct regmap_config aw200xx_regmap_config = {
        .disable_locking = true,
 };
 
+static void aw200xx_chip_reset_action(void *data)
+{
+       aw200xx_chip_reset(data);
+}
+
+static void aw200xx_disable_action(void *data)
+{
+       aw200xx_disable(data);
+}
+
 static int aw200xx_probe(struct i2c_client *client)
 {
        const struct aw200xx_chipdef *cdef;
@@ -568,11 +579,17 @@ static int aw200xx_probe(struct i2c_client *client)
 
        aw200xx_enable(chip);
 
+       ret = devm_add_action(&client->dev, aw200xx_disable_action, chip);
+       if (ret)
+               return ret;
+
        ret = aw200xx_chip_check(chip);
        if (ret)
                return ret;
 
-       mutex_init(&chip->mutex);
+       ret = devm_mutex_init(&client->dev, &chip->mutex);
+       if (ret)
+               return ret;
 
        /* Need a lock now since after call aw200xx_probe_fw, sysfs nodes 
created */
        mutex_lock(&chip->mutex);
@@ -581,6 +598,10 @@ static int aw200xx_probe(struct i2c_client *client)
        if (ret)
                goto out_unlock;
 
+       ret = devm_add_action(&client->dev, aw200xx_chip_reset_action, chip);
+       if (ret)
+               goto out_unlock;
+
        ret = aw200xx_probe_fw(&client->dev, chip);
        if (ret)
                goto out_unlock;
@@ -595,15 +616,6 @@ static int aw200xx_probe(struct i2c_client *client)
        return ret;
 }
 
-static void aw200xx_remove(struct i2c_client *client)
-{
-       struct aw200xx *chip = i2c_get_clientdata(client);
-
-       aw200xx_chip_reset(chip);
-       aw200xx_disable(chip);
-       mutex_destroy(&chip->mutex);
-}
-
 static const struct aw200xx_chipdef aw20036_cdef = {
        .channels = 36,
        .display_size_rows_max = 3,
@@ -652,7 +664,6 @@ static struct i2c_driver aw200xx_driver = {
                .of_match_table = aw200xx_match_table,
        },
        .probe_new = aw200xx_probe,
-       .remove = aw200xx_remove,
        .id_table = aw200xx_id,
 };
 module_i2c_driver(aw200xx_driver);
-- 
2.25.1