diff options
| author | Ioan-Adrian Ratiu <adi@adirat.com> | 2017-01-05 00:37:47 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-06 19:19:47 -0700 |
| commit | cab7c045f5fd2c269490c50469966e5fdff1aa53 (patch) | |
| tree | 95af061b1f044741b7fc59f760dc58094bb9a14c /sound | |
| parent | 8ced91a2e920ec00394274a13e46e15305a82e9f (diff) | |
ALSA: usb-audio: test EP_FLAG_RUNNING at urb completion
[ Upstream commit 13a6c8328e6056932dc680e447d4c5e8ad9add17 ]
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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/usb/endpoint.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index be1f511e4f54..ae2981460cd8 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 */ |