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[media] em28xx-audio: return -ENODEV when the device is disconnected 

If em28xx is disconnected, return -ENODEV to all PCM callbacks.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
hifive-unleashed-5.1
Mauro Carvalho Chehab 2014-01-12 10:21:42 -03:00
parent 966f416375
commit 8b1fa5798d
1 changed files with 41 additions and 2 deletions
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43
drivers/media/usb/em28xx/em28xx-audio.c
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@ -90,6 +90,12 @@ static void em28xx_audio_isocirq(struct urb *urb)
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
if (dev->disconnected) {
dprintk("device disconnected while streaming. URB status=%d.\n", urb->status);
atomic_set(&dev->stream_started, 0);
return;
}
switch (urb->status) {
case 0: /* success */
case -ETIMEDOUT: /* NAK */
@ -248,14 +254,17 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
struct snd_pcm_runtime *runtime = substream->runtime;
int ret = 0;
dprintk("opening device and trying to acquire exclusive lock\n");
if (!dev) {
em28xx_err("BUG: em28xx can't find device struct."
" Can't proceed with open\n");
return -ENODEV;
}
if (dev->disconnected)
return -ENODEV;
dprintk("opening device and trying to acquire exclusive lock\n");
runtime->hw = snd_em28xx_hw_capture;
if ((dev->alt == 0 || dev->audio_ifnum) && dev->adev.users == 0) {
int nonblock = !!(substream->f_flags & O_NONBLOCK);
@ -324,6 +333,10 @@ static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
int ret;
struct em28xx *dev = snd_pcm_substream_chip(substream);
if (dev->disconnected)
return -ENODEV;
dprintk("Setting capture parameters\n");
@ -363,6 +376,9 @@ static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
{
struct em28xx *dev = snd_pcm_substream_chip(substream);
if (dev->disconnected)
return -ENODEV;
dev->adev.hwptr_done_capture = 0;
dev->adev.capture_transfer_done = 0;
@ -388,6 +404,9 @@ static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
struct em28xx *dev = snd_pcm_substream_chip(substream);
int retval = 0;
if (dev->disconnected)
return -ENODEV;
switch (cmd) {
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
@ -414,6 +433,9 @@ static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
snd_pcm_uframes_t hwptr_done;
dev = snd_pcm_substream_chip(substream);
if (dev->disconnected)
return -ENODEV;
spin_lock_irqsave(&dev->adev.slock, flags);
hwptr_done = dev->adev.hwptr_done_capture;
spin_unlock_irqrestore(&dev->adev.slock, flags);
@ -435,6 +457,11 @@ static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *info)
{
struct em28xx *dev = snd_kcontrol_chip(kcontrol);
if (dev->disconnected)
return -ENODEV;
info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
info->count = 2;
info->value.integer.min = 0;
@ -453,6 +480,9 @@ static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
int nonblock = 0;
int rc;
if (dev->disconnected)
return -ENODEV;
if (substream)
nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
@ -488,6 +518,9 @@ static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
int nonblock = 0;
int val;
if (dev->disconnected)
return -ENODEV;
if (substream)
nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
@ -520,6 +553,9 @@ static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
int nonblock = 0;
int rc;
if (dev->disconnected)
return -ENODEV;
if (substream)
nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
@ -558,6 +594,9 @@ static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
int nonblock = 0;
int val;
if (dev->disconnected)
return -ENODEV;
if (substream)
nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {