[PATCH 4.9 03/47] ALSA: aloop: Fix initialization of controls

[Greg Kroah-Hartman]

From: Jonas Holmberg <jonashg@xxxxxxxx>

commit 168632a495f49f33a18c2d502fc249d7610375e9 upstream.

Add a control to the card before copying the id so that the numid field
is initialized in the copy. Otherwise the numid field of active_id,
format_id, rate_id and channels_id will be the same (0) and
snd_ctl_notify() will not queue the events properly.

Signed-off-by: Jonas Holmberg <jonashg@xxxxxxxx>
Reviewed-by: Jaroslav Kysela <perex@xxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210407075428.2666787-1-jonashg@xxxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 sound/drivers/aloop.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

--- a/sound/drivers/aloop.c
+++ b/sound/drivers/aloop.c
@@ -1062,6 +1062,14 @@ static int loopback_mixer_new(struct loo
 					return -ENOMEM;
 				kctl->id.device = dev;
 				kctl->id.subdevice = substr;
+
+				/* Add the control before copying the id so that
+				 * the numid field of the id is set in the copy.
+				 */
+				err = snd_ctl_add(card, kctl);
+				if (err < 0)
+					return err;
+
 				switch (idx) {
 				case ACTIVE_IDX:
 					setup->active_id = kctl->id;
@@ -1078,9 +1086,6 @@ static int loopback_mixer_new(struct loo
 				default:
 					break;
 				}
-				err = snd_ctl_add(card, kctl);
-				if (err < 0)
-					return err;
 			}
 		}
 	}