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ALSA: pcm: Call ack() whenever appl_ptr is updated 

Although the ack callback is supposed to be called at each appl_ptr or
hw_ptr update, we missed a few opportunities: namely, forward, rewind
and sync_ptr.

Formerly calling ack at rewind may have leaded to unexpected results
due to the forgotten negative appl_ptr update in indirect-PCM helper,
which is the major user of the PCM ack callback.  But now we fixed
this oversights, thus we can call ack callback safely even at rewind
callback -- of course with the proper handling of the error from the
callback.

This patch adds the calls of ack callback in the places mentioned in
the above.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2017-05-19 20:22:33 +02:00
parent 9ce7b9cf64
commit 9027c4639e
1 changed files with 37 additions and 9 deletions
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46
sound/core/pcm_native.c
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@ -2449,13 +2449,35 @@ static int do_pcm_hwsync(struct snd_pcm_substream *substream)
}
}
/* increase the appl_ptr; returns the processed frames */
/* update to the given appl_ptr and call ack callback if needed;
* when an error is returned, take back to the original value
*/
static int apply_appl_ptr(struct snd_pcm_substream *substream,
snd_pcm_uframes_t appl_ptr)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
int ret;
runtime->control->appl_ptr = appl_ptr;
if (substream->ops->ack) {
ret = substream->ops->ack(substream);
if (ret < 0) {
runtime->control->appl_ptr = old_appl_ptr;
return ret;
}
}
return 0;
}
/* increase the appl_ptr; returns the processed frames or a negative error */
static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
snd_pcm_uframes_t frames,
snd_pcm_sframes_t avail)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_sframes_t appl_ptr;
int ret;
if (avail <= 0)
return 0;
@ -2464,17 +2486,18 @@ static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
appl_ptr = runtime->control->appl_ptr + frames;
if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
appl_ptr -= runtime->boundary;
runtime->control->appl_ptr = appl_ptr;
return frames;
ret = apply_appl_ptr(substream, appl_ptr);
return ret < 0 ? ret : frames;
}
/* decrease the appl_ptr; returns the processed frames */
/* decrease the appl_ptr; returns the processed frames or a negative error */
static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
snd_pcm_uframes_t frames,
snd_pcm_sframes_t avail)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_sframes_t appl_ptr;
int ret;
if (avail <= 0)
return 0;
@ -2483,8 +2506,8 @@ static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
appl_ptr = runtime->control->appl_ptr - frames;
if (appl_ptr < 0)
appl_ptr += runtime->boundary;
runtime->control->appl_ptr = appl_ptr;
return frames;
ret = apply_appl_ptr(substream, appl_ptr);
return ret < 0 ? ret : frames;
}
static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
@ -2610,10 +2633,15 @@ static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
return err;
}
snd_pcm_stream_lock_irq(substream);
if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
control->appl_ptr = sync_ptr.c.control.appl_ptr;
else
if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
err = apply_appl_ptr(substream, sync_ptr.c.control.appl_ptr);
if (err < 0) {
snd_pcm_stream_unlock_irq(substream);
return err;
}
} else {
sync_ptr.c.control.appl_ptr = control->appl_ptr;
}
if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
control->avail_min = sync_ptr.c.control.avail_min;
else