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 @@ -1572,6 +1572,14 @@ 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; @@ -1588,9 +1596,6 @@ static int loopback_mixer_new(struct loo default: break; } - err = snd_ctl_add(card, kctl); - if (err < 0) - return err; } } }
