V4L/DVB (9305): radio-mr800: Add BKL for usb_amradio_open()

Added BKL for usb_amradio_open()

Signed-off-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Douglas Schilling Landgraf <dougsland@linuxtv.org>
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 a33717c48003..256cbeffdcb6 100644
--- a/drivers/media/radio/radio-mr800.c
+++ b/drivers/media/radio/radio-mr800.c
@@ -469,16 +469,21 @@ static int usb_amradio_open(struct inode *inode, struct file *file)
 {
         struct amradio_device *radio = video_get_drvdata(video_devdata(file));
 
+        lock_kernel();
+
         radio->users = 1;
         radio->muted = 1;
 
         if (amradio_start(radio) < 0) {
                 warn("Radio did not start up properly");
                 radio->users = 0;
+                unlock_kernel();
                 return -EIO;
         }
         if (amradio_setfreq(radio, radio->curfreq) < 0)
                 warn("Set frequency failed");
+
+        unlock_kernel();
         return 0;
 }