ALSA: use correct lock in snd_ctl_dev_disconnect()

The lock used in snd_ctl_dev_disconnect() should be card->ctl_files_rwlock
for protection of card->ctl_files entries, instead of card->controls_rwsem.

Reported-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 2 insertions, 2 deletions

diff --git a/sound/core/control.c b/sound/core/control.c
index 3c5e746d619b..6d71f9a7ccbb 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1438,12 +1438,12 @@ static int snd_ctl_dev_disconnect(struct snd_device *device)
         if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS))
                 return -ENXIO;
 
-        down_read(&card->controls_rwsem);
+        read_lock(&card->ctl_files_rwlock);
         list_for_each_entry(ctl, &card->ctl_files, list) {
                 wake_up(&ctl->change_sleep);
                 kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);
         }
-        up_read(&card->controls_rwsem);
+        read_unlock(&card->ctl_files_rwlock);
 
         if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
                                          card, -1)) < 0)