When the USB host stops capture/playback, the corresponding PCM
substream (if activated and running) is stopped and drained.
Signed-off-by: Pavel Hofman <pavel.hofman@xxxxxxxxxxx>
---
drivers/usb/gadget/function/u_audio.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index a6293415c071..9dbce51c2eb7 100644
--- a/drivers/usb/gadget/function/u_audio.c
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -544,6 +544,20 @@ static void set_reported_srate(struct uac_rtd_params *prm, int srate)
}
}
+static void stop_substream(struct uac_rtd_params *prm)
+{
+ unsigned long _flags;
+ struct snd_pcm_substream *substream;
+
+ substream = prm->ss;
+ if (substream) {
+ snd_pcm_stream_lock_irqsave(substream, _flags);
+ if (snd_pcm_running(substream))
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_DRAINING);
+ snd_pcm_stream_unlock_irqrestore(substream, _flags);
+ }
+}
+
int u_audio_start_capture(struct g_audio *audio_dev)
{
struct snd_uac_chip *uac = audio_dev->uac;
@@ -630,6 +644,7 @@ void u_audio_stop_capture(struct g_audio *audio_dev)
{
struct snd_uac_chip *uac = audio_dev->uac;
+ stop_substream(&uac->c_prm);
set_reported_srate(&uac->c_prm, 0);
if (audio_dev->in_ep_fback)
free_ep_fback(&uac->c_prm, audio_dev->in_ep_fback);
@@ -713,6 +728,7 @@ void u_audio_stop_playback(struct g_audio *audio_dev)
{
struct snd_uac_chip *uac = audio_dev->uac;
+ stop_substream(&uac->p_prm);
set_reported_srate(&uac->p_prm, 0);
free_ep(&uac->p_prm, audio_dev->in_ep);
}
--
2.25.1
