ASoC: Remove locking in snd_soc_{new,free}_ac97_codec()

snd_soc_new_ac97_codec() and snd_soc_free_ac97_codec() are called from
within a CODEC's probe() and remove() callbacks. Those will not run
concurrently against each other for the same CODEC instance, hence it is not
necessary to protect the two functions with a mutex.

This removes the last user in the ASoC core of the snd_soc_codec mutex field
and will allow us to eventually remove it.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 1 insertions, 8 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index d4bfd4a9076f..a504cf42bf0a 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2107,13 +2107,9 @@ static struct platform_driver soc_driver = {
 int snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
         struct snd_ac97_bus_ops *ops, int num)
 {
-        mutex_lock(&codec->mutex);
-
         codec->ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
-        if (codec->ac97 == NULL) {
-                mutex_unlock(&codec->mutex);
+        if (codec->ac97 == NULL)
                 return -ENOMEM;
-        }
 
         codec->ac97->bus = kzalloc(sizeof(struct snd_ac97_bus), GFP_KERNEL);
         if (codec->ac97->bus == NULL) {
@@ -2132,7 +2128,6 @@ int snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
          */
         codec->ac97_created = 1;
 
-        mutex_unlock(&codec->mutex);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec);
@@ -2302,7 +2297,6 @@ EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset);
  */
 void snd_soc_free_ac97_codec(struct snd_soc_codec *codec)
 {
-        mutex_lock(&codec->mutex);
 #ifdef CONFIG_SND_SOC_AC97_BUS
         soc_unregister_ac97_codec(codec);
 #endif
@@ -2310,7 +2304,6 @@ void snd_soc_free_ac97_codec(struct snd_soc_codec *codec)
         kfree(codec->ac97);
         codec->ac97 = NULL;
         codec->ac97_created = 0;
-        mutex_unlock(&codec->mutex);
 }
 EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec);