[patch 07/16] ALSA: use correct lock in snd_ctl_dev_disconnect()

[Greg KH <gregkh@suse.de>]

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2.6.25-stable review patch.  If anyone has any objections, please let us know.

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From: Takashi Iwai <tiwai@suse.de>

commit d8009882e9f5e1a76986c741f071edd2ad760c97 upstream

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>
Cc: Chris Wedgwood <cw@f00f.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 sound/core/control.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1426,12 +1426,12 @@ static int snd_ctl_dev_disconnect(struct
 	cardnum = card->number;
 	snd_assert(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)

--