Commit 13a6c832 authored by Ioan-Adrian Ratiu's avatar Ioan-Adrian Ratiu Committed by Takashi Iwai

ALSA: usb-audio: test EP_FLAG_RUNNING at urb completion

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: 's avatarIoan-Adrian Ratiu <adi@adirat.com>
Signed-off-by: 's avatarTakashi Iwai <tiwai@suse.de>
parent 1d0f9530
......@@ -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 */
......
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