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path: root/drivers/media/radio/radio-aztech.c
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Diffstat (limited to 'drivers/media/radio/radio-aztech.c')
-rw-r--r--drivers/media/radio/radio-aztech.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/media/radio/radio-aztech.c b/drivers/media/radio/radio-aztech.c
index 628c689e3ff..ae18a7cf0d5 100644
--- a/drivers/media/radio/radio-aztech.c
+++ b/drivers/media/radio/radio-aztech.c
@@ -70,6 +70,7 @@ static struct mutex lock;
struct az_device
{
+ unsigned long in_use;
int curvol;
unsigned long curfreq;
int stereo;
@@ -342,10 +343,21 @@ static int vidioc_s_ctrl (struct file *file, void *priv,
static struct az_device aztech_unit;
+static int aztech_exclusive_open(struct inode *inode, struct file *file)
+{
+ return test_and_set_bit(0, &aztech_unit.in_use) ? -EBUSY : 0;
+}
+
+static int aztech_exclusive_release(struct inode *inode, struct file *file)
+{
+ clear_bit(0, &aztech_unit.in_use);
+ return 0;
+}
+
static const struct file_operations aztech_fops = {
.owner = THIS_MODULE,
- .open = video_exclusive_open,
- .release = video_exclusive_release,
+ .open = aztech_exclusive_open,
+ .release = aztech_exclusive_release,
.ioctl = video_ioctl2,
#ifdef CONFIG_COMPAT
.compat_ioctl = v4l_compat_ioctl32,