V4L/DVB (10461): radio-mr800: add few lost mutex locks

Patch adds two lost mutex locks.

Signed-off-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/media/radio/radio-mr800.c b/drivers/media/radio/radio-mr800.c
index 25ccf21c469e..56f1fac6d28d 100644
--- a/drivers/media/radio/radio-mr800.c
+++ b/drivers/media/radio/radio-mr800.c
@@ -431,7 +431,10 @@ static int vidioc_s_frequency(struct file *file, void *priv,
         if (radio->removed)
                 return -EIO;
 
+        mutex_lock(&radio->lock);
         radio->curfreq = f->frequency;
+        mutex_unlock(&radio->lock);
+
         retval = amradio_setfreq(radio, radio->curfreq);
         if (retval < 0)
                 amradio_dev_warn(&radio->videodev->dev,
@@ -599,7 +602,9 @@ static int usb_amradio_close(struct file *file)
         if (!radio)
                 return -ENODEV;
 
+        mutex_lock(&radio->lock);
         radio->users = 0;
+        mutex_unlock(&radio->lock);
 
         if (!radio->removed) {
                 retval = amradio_set_mute(radio, AMRADIO_STOP);