ALSA: snd-usb: add snd_usb_audio-wide mutex

This is needed for new card-wide list operations.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 4a7be7b98331..6bc88b7ce4fd 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -276,6 +276,7 @@ static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 
 static int snd_usb_audio_free(struct snd_usb_audio *chip)
 {
+        mutex_destroy(&chip->mutex);
         kfree(chip);
         return 0;
 }
@@ -336,6 +337,7 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
                 return -ENOMEM;
         }
 
+        mutex_init(&chip->mutex);
         mutex_init(&chip->shutdown_mutex);
         chip->index = idx;
         chip->dev = dev;