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path: root/drivers/media/video/c-qcam.c
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Diffstat (limited to 'drivers/media/video/c-qcam.c')
-rw-r--r--drivers/media/video/c-qcam.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/media/video/c-qcam.c b/drivers/media/video/c-qcam.c
index 7f6c6b4bec10..2196c1dc5aee 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,