V4L/DVB (10519): em28xx: Fix for em28xx audio startup

Essentially if a snd_em28xx_capture_trigger() stop followed by a snd_em28xx_capture_trigger() start would not yield any
data because there was some logic put in with an adev->shutdown variable which did not seem warranted in my humble opinion.
It would cause snd_em28xx_capture_trigger start never to start up the audio stream until the device was closed and
reopened again. Upon re-opening the device adev->shutdown is reset and audio data would again flow.

Signed-off-by: Robert Krakora <rob.krakora@messagenetsystems.com>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/em28xx/em28xx-audio.c

@@ -152,9 +152,6 @@ static void em28xx_audio_isocirq(struct urb *urb)
 	}
 	urb->status = 0;
 
-	if (dev->adev.shutdown)
-		return;
-
 	status = usb_submit_urb(urb, GFP_ATOMIC);
 	if (status < 0) {
 		em28xx_errdev("resubmit of audio urb failed (error=%i)\n",
@@ -340,13 +337,6 @@ static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 	em28xx_audio_analog_set(dev);
 	mutex_unlock(&dev->lock);
 
-	if (dev->adev.users == 0 && dev->adev.shutdown == 1) {
-		dprintk("audio users: %d\n", dev->adev.users);
-		dprintk("disabling audio stream!\n");
-		dev->adev.shutdown = 0;
-		dprintk("released lock\n");
-		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
-	}
 	return 0;
 }
 
@@ -399,7 +389,7 @@ static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
 		return 0;
 	case SNDRV_PCM_TRIGGER_STOP:
-		dev->adev.shutdown = 1;
+		em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
 		return 0;
 	default:
 		return -EINVAL;

drivers/media/video/em28xx/em28xx.h

@@ -423,7 +423,7 @@ struct em28xx_audio {
 	unsigned int hwptr_done_capture;
 	struct snd_card            *sndcard;
 
-	int users, shutdown;
+	int users;
 	enum em28xx_stream_state capture_stream;
 	spinlock_t slock;
 };