This patch keeps the process from sleeping after the PCM middle layer has
stopped playback by calling the pcm trigger callback. The patch is needed
to prevent aplay from causing a pcm_write Input/Output error.
Signed-off-by: Christian Gromm <christian.gr...@microchip.com>
---
drivers/staging/most/aim-sound/sound.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/most/aim-sound/sound.c
b/drivers/staging/most/aim-sound/sound.c
index df14ce5..f08545c 100644
--- a/drivers/staging/most/aim-sound/sound.c
+++ b/drivers/staging/most/aim-sound/sound.c
@@ -239,9 +239,9 @@ static int playback_thread(void *data)
wait_event_interruptible(
channel->playback_waitq,
kthread_should_stop() ||
- (mbo = most_get_mbo(channel->iface, channel->id,
- &audio_aim)));
-
+ (channel->is_stream_running &&
+ (mbo = most_get_mbo(channel->iface, channel->id,
+ &audio_aim))));
if (!mbo)
continue;
@@ -279,11 +279,12 @@ static int pcm_open(struct snd_pcm_substream *substream)
channel->substream = substream;
if (cfg->direction == MOST_CH_TX) {
- init_waitqueue_head(&channel->playback_waitq);
channel->playback_task = kthread_run(&playback_thread, channel,
"most_audio_playback");
- if (IS_ERR(channel->playback_task))
+ if (IS_ERR(channel->playback_task)) {
+ pr_err("Couldn't start thread\n");
return PTR_ERR(channel->playback_task);
+ }
}
if (most_start_channel(channel->iface, channel->id, &audio_aim)) {
@@ -336,8 +337,10 @@ static int pcm_hw_params(struct snd_pcm_substream
*substream,
struct channel *channel = substream->private_data;
if ((params_channels(hw_params) > channel->pcm_hardware.channels_max) ||
- (params_channels(hw_params) < channel->pcm_hardware.channels_min))
+ (params_channels(hw_params) < channel->pcm_hardware.channels_min)) {
+ pr_err("Requested number of channels not supported.\n");
return -EINVAL;
+ }
return snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
}
@@ -422,6 +425,7 @@ static int pcm_trigger(struct snd_pcm_substream *substream,
int cmd)
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
channel->is_stream_running = true;
+ wake_up_interruptible(&channel->playback_waitq);
return 0;
case SNDRV_PCM_TRIGGER_STOP:
@@ -606,6 +610,7 @@ static int audio_probe_channel(struct most_interface
*iface, int channel_id,
channel->cfg = cfg;
channel->iface = iface;
channel->id = channel_id;
+ init_waitqueue_head(&channel->playback_waitq);
if (audio_set_hw_params(&channel->pcm_hardware, pcm_format, cfg))
goto err_free_card;
--
1.7.9.5
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