V4L/DVB (8780): v4l: replace the last uses of video_exclusive_open/release

Handle the video_exclusive_open/release functionality inside the
driver.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/media/video/w9966.c b/drivers/media/video/w9966.c
index 2ff00bc5ad64..c635cffb1fb8 100644
--- a/drivers/media/video/w9966.c
+++ b/drivers/media/video/w9966.c
@@ -113,6 +113,7 @@ struct w9966_dev {
         signed char contrast;
         signed char color;
         signed char hue;
+        unsigned long in_use;
 };
 
 /*
@@ -184,10 +185,27 @@ static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
 static ssize_t w9966_v4l_read(struct file *file, char __user *buf,
                               size_t count, loff_t *ppos);
 
+static int w9966_exclusive_open(struct inode *inode, struct file *file)
+{
+        struct video_device *vdev = video_devdata(file);
+        struct w9966_dev *cam = vdev->priv;
+
+        return test_and_set_bit(0, &cam->in_use) ? -EBUSY : 0;
+}
+
+static int w9966_exclusive_release(struct inode *inode, struct file *file)
+{
+        struct video_device *vdev = video_devdata(file);
+        struct w9966_dev *cam = vdev->priv;
+
+        clear_bit(0, &cam->in_use);
+        return 0;
+}
+
 static const struct file_operations w9966_fops = {
         .owner          = THIS_MODULE,
-        .open           = video_exclusive_open,
-        .release        = video_exclusive_release,
+        .open           = w9966_exclusive_open,
+        .release        = w9966_exclusive_release,
         .ioctl          = w9966_v4l_ioctl,
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = v4l_compat_ioctl32,