| Message ID | 20170104223747.2742-3-adi@adirat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index 2f0ea70a998c..c90607ebe155 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -384,6 +384,9 @@ static void snd_complete_urb(struct urb *urb) if (unlikely(atomic_read(&ep->chip->shutdown))) goto exit_clear; + if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) + goto exit_clear; + if (usb_pipeout(ep->pipe)) { retire_outbound_urb(ep, ctx); /* can be stopped during retire callback */
Testing EP_FLAG_RUNNING in snd_complete_urb() before running the completion logic allows us to save a few cpu cycles by returning early, skipping the pending urb in case the stream was stopped; the stop logic handles the urb and sets the completion callbacks to NULL. Signed-off-by: Ioan-Adrian Ratiu <adi@adirat.com> --- sound/usb/endpoint.c | 3 +++ 1 file changed, 3 insertions(+)