leds: leds-pca9532 - fix memory leak and properly handle errors

When the registration fails, we need to release the memory we allocated.
Also we need to save the error from led_classdev_register and propagate
it up, else we'll return success, even if we failed.

Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

diff --git a/drivers/leds/leds-pca9532.c b/drivers/leds/leds-pca9532.c
index f0883e6..62b60a0 100644 (file)
--- a/drivers/leds/leds-pca9532.c
+++ b/drivers/leds/leds-pca9532.c
@@ -204,8 +204,8 @@ static int pca9532_configure(struct i2c_client *client,
                        led->ldev.brightness = LED_OFF;
                        led->ldev.brightness_set = pca9532_set_brightness;
                        led->ldev.blink_set = pca9532_set_blink;
-                       if (led_classdev_register(&client->dev,
-                               &led->ldev) < 0)        {
+                       err = led_classdev_register(&client->dev, &led->ldev);
+                       if (err < 0) {
                                dev_err(&client->dev,
                                        "couldn't register LED %s\n",
                                        led->name);
@@ -263,7 +263,6 @@ exit:
                        }
 
        return err;
-
 }
 
 static int pca9532_probe(struct i2c_client *client,
@@ -271,12 +270,16 @@ static int pca9532_probe(struct i2c_client *client,
 {
        struct pca9532_data *data = i2c_get_clientdata(client);
        struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data;
+       int err;
+
+       if (!pca9532_pdata)
+               return -EIO;
 
        if (!i2c_check_functionality(client->adapter,
                I2C_FUNC_SMBUS_BYTE_DATA))
                return -EIO;
 
-       data = kzalloc(sizeof(struct pca9532_data), GFP_KERNEL);
+       data = kzalloc(sizeof(*data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;
 
@@ -285,12 +288,13 @@ static int pca9532_probe(struct i2c_client *client,
        data->client = client;
        mutex_init(&data->update_lock);
 
-       if (pca9532_pdata == NULL)
-               return -EIO;
-
-       pca9532_configure(client, data, pca9532_pdata);
-       return 0;
+       err = pca9532_configure(client, data, pca9532_pdata);
+       if (err) {
+               kfree(data);
+               i2c_set_clientdata(client, NULL);
+       }
 
+       return err;
 }
 
 static int pca9532_remove(struct i2c_client *client)