The recent endpoint management change for implicit feedback mode added a clearance of ep->sync_sink (formerly ep->sync_slave) pointer at snd_usb_endpoint_stop() to assure no leftover for the feedback from the already stopped capture stream. This turned out to cause a regression, however, when full-duplex streams were running and only a capture was stopped. Because of the above clearance of ep->sync_sink pointer, no more feedback is done, hence the playback will stall.

This patch fixes the ep->sync_sink clearance to be done only after all endpoints are released, for addressing the regression.

Reported-and-tested-by: Lucas Endres jaffa225man@gmail.com Fixes: bf6313a0ff76 ("ALSA: usb-audio: Refactor endpoint management") Cc: stable@vger.kernel.org Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/usb/endpoint.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index f4c3d2b38abb..014c43862826 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -1443,11 +1443,11 @@ void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep) if (snd_BUG_ON(!atomic_read(&ep->running))) return;

- if (ep->sync_source) - WRITE_ONCE(ep->sync_source->sync_sink, NULL); - - if (!atomic_dec_return(&ep->running)) + if (!atomic_dec_return(&ep->running)) { + if (ep->sync_source) + WRITE_ONCE(ep->sync_source->sync_sink, NULL); stop_urbs(ep, false); + } }

/**