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authorTakashi Iwai <tiwai@suse.de>2021-04-26 08:33:49 +0200
committerTakashi Iwai <tiwai@suse.de>2021-04-26 08:37:05 +0200
commit988cc17552606be67a956cf8cd6ff504cfc5d643 (patch)
tree6495c8fe777cb6dec691b936e0ea95a700d7b1be
parent316791b556f7c4aeb7a7fea8f400f4434e71d1bf (diff)
ALSA: usb-audio: Fix implicit sync clearance at stopping stream
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> Link: https://lore.kernel.org/r/20210426063349.18601-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/usb/endpoint.c8
1 files 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);
+ }
}
/**