V4L/DVB (10520): em28xx-audio: Add spinlock for trigger

Added spinlock for trigger session

Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c
index 52c6657d61cf..8e9957dbdbec 100644
--- a/drivers/media/video/em28xx/em28xx-audio.c
+++ b/drivers/media/video/em28xx/em28xx-audio.c
@@ -381,19 +381,27 @@ static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
                                       int cmd)
 {
         struct em28xx *dev = snd_pcm_substream_chip(substream);
+        int retval;
 
         dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
                                        "start": "stop");
+
+        spin_lock(&dev->adev.slock);
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_START:
                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
-                return 0;
+                retval = 0;
+                break;
         case SNDRV_PCM_TRIGGER_STOP:
                 em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
-                return 0;
+                retval = 0;
+                break;
         default:
-                return -EINVAL;
+                retval = -EINVAL;
         }
+
+        spin_unlock(&dev->adev.slock);
+        return retval;
 }
 
 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream