ALSA: ASoC: Fix cs4270 error path

The error path in cs4270_probe/cs4270_remove is pretty broken:
* If cs4270_probe fails, codec is leaked.
* If snd_soc_register_card fails, cs4270_i2c_driver stays registered.
* If I2C support is enabled but no I2C device is found, i2c_del_driver
  is never called (neither in cs4270_probe nor in cs4270_remove.

Fix all 3 problems by implementing a clean error path in cs4270_probe
and jumping to its labels as needed.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c
index d68650d..0bbd945 100644 (file)
--- a/sound/soc/codecs/cs4270.c
+++ b/sound/soc/codecs/cs4270.c
@@ -681,7 +681,7 @@ static int cs4270_probe(struct platform_device *pdev)
        ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
        if (ret < 0) {
                printk(KERN_ERR "cs4270: failed to create PCMs\n");
-               return ret;
+               goto error_free_codec;
        }
 
 #ifdef USE_I2C
@@ -690,8 +690,7 @@ static int cs4270_probe(struct platform_device *pdev)
        ret = i2c_add_driver(&cs4270_i2c_driver);
        if (ret) {
                printk(KERN_ERR "cs4270: failed to attach driver");
-               snd_soc_free_pcms(socdev);
-               return ret;
+               goto error_free_pcms;
        }
 
        /* Did we find a CS4270 on the I2C bus? */
@@ -713,10 +712,23 @@ static int cs4270_probe(struct platform_device *pdev)
        ret = snd_soc_register_card(socdev);
        if (ret < 0) {
                printk(KERN_ERR "cs4270: failed to register card\n");
-               snd_soc_free_pcms(socdev);
-               return ret;
+               goto error_del_driver;
        }
 
+       return 0;
+
+error_del_driver:
+#ifdef USE_I2C
+       i2c_del_driver(&cs4270_i2c_driver);
+
+error_free_pcms:
+#endif
+       snd_soc_free_pcms(socdev);
+
+error_free_codec:
+       kfree(socdev->codec);
+       socdev->codec = NULL;
+
        return ret;
 }
 
@@ -727,8 +739,7 @@ static int cs4270_remove(struct platform_device *pdev)
        snd_soc_free_pcms(socdev);
 
 #ifdef USE_I2C
-       if (socdev->codec->control_data)
-               i2c_del_driver(&cs4270_i2c_driver);
+       i2c_del_driver(&cs4270_i2c_driver);
 #endif
 
        kfree(socdev->codec);