ALSA: usb-audio: stop both data and sync endpoints asynchronously

As we are stopping the endpoints asynchronously now, it's better to
trigger the stop of both data and sync endpoints and wait for pending
stopping operations, instead of the sequential trigger-and-wait
procedure.

So the wait argument in snd_usb_endpoint_stop() is dropped, and it's
expected that the caller synchronizes explicitly by calling
snd_usb_endpoint_sync_pending_stop().  (Actually there is only one
place calling this, so it was safe to change.)

Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 13 insertions, 9 deletions

diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 6db2143350d3..f487d26f8d40 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -896,8 +896,11 @@ __error:
  * actually be deactivated.
  *
  * Must be balanced to calls of snd_usb_endpoint_start().
+ *
+ * The caller needs to synchronize the pending stop operation via
+ * snd_usb_endpoint_sync_pending_stop().
  */
-void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, bool wait)
+void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep)
 {
         if (!ep)
                 return;
@@ -911,11 +914,7 @@ void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, bool wait)
                 ep->sync_slave = NULL;
                 ep->retire_data_urb = NULL;
                 ep->prepare_data_urb = NULL;
-
-                if (wait)
-                        wait_clear_urbs(ep);
-                else
-                        set_bit(EP_FLAG_STOPPING, &ep->flags);
+                set_bit(EP_FLAG_STOPPING, &ep->flags);
         }
 }
 
diff --git a/sound/usb/endpoint.h b/sound/usb/endpoint.h
index f1e451da9a67..447902dd8a4a 100644
--- a/sound/usb/endpoint.h
+++ b/sound/usb/endpoint.h
@@ -17,7 +17,7 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
                                 struct snd_usb_endpoint *sync_ep);
 
 int  snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep);
-void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, bool wait);
+void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep);
 void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep);
 int  snd_usb_endpoint_activate(struct snd_usb_endpoint *ep);
 int  snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep);
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index d90604aa5137..4750d3d5c0cc 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -266,10 +266,15 @@ static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
 {
         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
-                snd_usb_endpoint_stop(subs->sync_endpoint, wait);
+                snd_usb_endpoint_stop(subs->sync_endpoint);
 
         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
-                snd_usb_endpoint_stop(subs->data_endpoint, wait);
+                snd_usb_endpoint_stop(subs->data_endpoint);
+
+        if (wait) {
+                snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
+                snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
+        }
 }
 
 static int deactivate_endpoints(struct snd_usb_substream *subs)