1 files changed, 21 insertions, 2 deletions

diff --git a/drivers/media/video/c-qcam.c b/drivers/media/video/c-qcam.c
index 7f6c6b4bec10..17aa0adb3467 100644
--- a/drivers/media/video/c-qcam.c
+++ b/drivers/media/video/c-qcam.c
@@ -51,6 +51,7 @@ struct qcam_device {
         int contrast, brightness, whitebal;
         int top, left;
         unsigned int bidirectional;
+        unsigned long in_use;
         struct mutex lock;
 };
 
@@ -687,11 +688,28 @@ static ssize_t qcam_read(struct file *file, char __user *buf,
         return len;
 }
 
+static int qcam_exclusive_open(struct inode *inode, struct file *file)
+{
+        struct video_device *dev = video_devdata(file);
+        struct qcam_device *qcam = (struct qcam_device *)dev;
+
+        return test_and_set_bit(0, &qcam->in_use) ? -EBUSY : 0;
+}
+
+static int qcam_exclusive_release(struct inode *inode, struct file *file)
+{
+        struct video_device *dev = video_devdata(file);
+        struct qcam_device *qcam = (struct qcam_device *)dev;
+
+        clear_bit(0, &qcam->in_use);
+        return 0;
+}
+
 /* video device template */
 static const struct file_operations qcam_fops = {
         .owner          = THIS_MODULE,
-        .open           = video_exclusive_open,
-        .release        = video_exclusive_release,
+        .open           = qcam_exclusive_open,
+        .release        = qcam_exclusive_release,
         .ioctl          = qcam_ioctl,
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = v4l_compat_ioctl32,
@@ -704,6 +722,7 @@ static struct video_device qcam_template=
 {
         .name           = "Colour QuickCam",
         .fops           = &qcam_fops,
+        .release        = video_device_release_empty,
 };
 
 /* Initialize the QuickCam driver control structure. */