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ALSA: usb-audio: stop both data and sync endpoints asynchronously

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As we are stopping the endpoints asynchronously now, it's better to
trigger the stop of both data and sync endpoints and wait for pending
stopping operations, instead of the sequential trigger-and-wait
procedure.

So the wait argument in snd_usb_endpoint_stop() is dropped, and it's
expected that the caller synchronizes explicitly by calling
snd_usb_endpoint_sync_pending_stop().  (Actually there is only one
place calling this, so it was safe to change.)

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-11-21 08:30:48 +01:00
parent ccc1696d52
commit b2eb950de2
3 changed files with 13 additions and 9 deletions
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11
sound/usb/endpoint.c
View File

@ -896,8 +896,11 @@ int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep)
* actually be deactivated.
*
* Must be balanced to calls of snd_usb_endpoint_start().
*
* The caller needs to synchronize the pending stop operation via
* snd_usb_endpoint_sync_pending_stop().
*/
void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, bool wait)
void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep)
{
if (!ep)
return;
@ -911,11 +914,7 @@ void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, bool wait)
ep->sync_slave = NULL;
ep->retire_data_urb = NULL;
ep->prepare_data_urb = NULL;
if (wait)
wait_clear_urbs(ep);
else
set_bit(EP_FLAG_STOPPING, &ep->flags);
set_bit(EP_FLAG_STOPPING, &ep->flags);
}
}

2
sound/usb/endpoint.h
View File

@ -17,7 +17,7 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
struct snd_usb_endpoint *sync_ep);
int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep);
void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, bool wait);
void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep);
void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep);
int snd_usb_endpoint_activate(struct snd_usb_endpoint *ep);
int snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep);

9
sound/usb/pcm.c
View File

@ -266,10 +266,15 @@ static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
{
if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
snd_usb_endpoint_stop(subs->sync_endpoint, wait);
snd_usb_endpoint_stop(subs->sync_endpoint);
if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
snd_usb_endpoint_stop(subs->data_endpoint, wait);
snd_usb_endpoint_stop(subs->data_endpoint);
if (wait) {
snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
}
}
static int deactivate_endpoints(struct snd_usb_substream *subs)