ALSA: usb-audio: uac1: Invalidate ctl on interrupt

[ Upstream commit b2500b584cfd228d67e1e43daf27c8af865b499e ]

When an interrupt occurs, the value of at least one of the belonging
controls should have changed. To make sure they get re-read from device
on the next read, invalidate the cache. This was correctly implemented
for uac2 already, but missing for uac1.

Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 024864ce3f761cec6a7992cb66d8ce03c6875155..60423d2572c7d4c8f6156d767ec60de73af4a597 100644 (file)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2397,9 +2397,14 @@ void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
 {
        struct usb_mixer_elem_list *list;
 
-       for (list = mixer->id_elems[unitid]; list; list = list->next_id_elem)
+       for (list = mixer->id_elems[unitid]; list; list = list->next_id_elem) {
+               struct usb_mixer_elem_info *info =
+                       (struct usb_mixer_elem_info *)list;
+               /* invalidate cache, so the value is read from the device */
+               info->cached = 0;
                snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                               &list->kctl->id);
+       }
 }
 
 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,