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[media] em28xx-audio: don't wait for lock in non-block mode

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Pulseaudio has the bad habit of stopping a streaming audio if
a device, opened in non-block mode, waits.

It is impossible to avoid em28xx to wait, as it will send commands
via I2C, and other I2C operations may be happening (firmware
transfers, Remote Controller polling, etc). Yet, as each em28xx
subdriver locks em28xx-dev to protect the access to the hardware,
it is possible to minimize the audio glitches by returning -EAGAIN
to pulseaudio, if the lock is already taken by another subdriver.

Reported-by: Antti Palosaari <crope@iki.fi>
Tested-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2014-01-12 09:22:29 -03:00
parent 49677aef90
commit 34906633fa
1 changed files with 43 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
drivers/media/usb/em28xx/em28xx-audio.c
View File

@ -258,6 +258,13 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
runtime->hw = snd_em28xx_hw_capture;
if ((dev->alt == 0 || dev->audio_ifnum) && dev->adev.users == 0) {
int nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
if (!mutex_trylock(&dev->lock))
return -EAGAIN;
} else
mutex_lock(&dev->lock);
if (dev->audio_ifnum)
dev->alt = 1;
else
@ -269,7 +276,6 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
/* Sets volume, mute, etc */
dev->mute = 0;
mutex_lock(&dev->lock);
ret = em28xx_audio_analog_set(dev);
if (ret < 0)
goto err;
@ -441,11 +447,19 @@ static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *value)
{
struct em28xx *dev = snd_kcontrol_chip(kcontrol);
struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
(0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
int nonblock = 0;
int rc;
mutex_lock(&dev->lock);
if (substream)
nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
if (!mutex_trylock(&dev->lock))
return -EAGAIN;
} else
mutex_lock(&dev->lock);
rc = em28xx_read_ac97(dev, kcontrol->private_value);
if (rc < 0)
goto err;
@ -470,9 +484,17 @@ static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *value)
{
struct em28xx *dev = snd_kcontrol_chip(kcontrol);
struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
int nonblock = 0;
int val;
mutex_lock(&dev->lock);
if (substream)
nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
if (!mutex_trylock(&dev->lock))
return -EAGAIN;
} else
mutex_lock(&dev->lock);
val = em28xx_read_ac97(dev, kcontrol->private_value);
mutex_unlock(&dev->lock);
if (val < 0)
@ -494,9 +516,17 @@ static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
{
struct em28xx *dev = snd_kcontrol_chip(kcontrol);
u16 val = value->value.integer.value[0];
struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
int nonblock = 0;
int rc;
mutex_lock(&dev->lock);
if (substream)
nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
if (!mutex_trylock(&dev->lock))
return -EAGAIN;
} else
mutex_lock(&dev->lock);
rc = em28xx_read_ac97(dev, kcontrol->private_value);
if (rc < 0)
goto err;
@ -524,9 +554,17 @@ static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *value)
{
struct em28xx *dev = snd_kcontrol_chip(kcontrol);
struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
int nonblock = 0;
int val;
mutex_lock(&dev->lock);
if (substream)
nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
if (!mutex_trylock(&dev->lock))
return -EAGAIN;
} else
mutex_lock(&dev->lock);
val = em28xx_read_ac97(dev, kcontrol->private_value);
mutex_unlock(&dev->lock);
if (val < 0)