1 files changed, 21 insertions, 20 deletions

diff --git a/linux/drivers/media/video/zr364xx.c b/linux/drivers/media/video/zr364xx.c
index dbfdd6966..a2a632534 100644
--- a/linux/drivers/media/video/zr364xx.c
+++ b/linux/drivers/media/video/zr364xx.c
@@ -117,6 +117,7 @@ struct zr364xx_camera {
 	int height;
 	int method;
 	struct mutex lock;
+	int users;
 };
 
 
@@ -642,25 +643,22 @@ static int zr364xx_open(struct inode *inode, struct file *file)
 
 	DBG("zr364xx_open");
 
-	cam->skip = 2;
+	mutex_lock(&cam->lock);
 
-	lock_kernel();
-	err = video_exclusive_open(inode, file);
-	if (err < 0) {
-		unlock_kernel();
-		return err;
+	if (cam->users) {
+		err = -EBUSY;
+		goto out;
 	}
 
 	if (!cam->framebuf) {
 		cam->framebuf = vmalloc_32(MAX_FRAME_SIZE * FRAMES);
 		if (!cam->framebuf) {
 			info("vmalloc_32 failed!");
-			unlock_kernel();
-			return -ENOMEM;
+			err = -ENOMEM;
+			goto out;
 		}
 	}
 
-	mutex_lock(&cam->lock);
 	for (i = 0; init[cam->method][i].size != -1; i++) {
 		err =
 		    send_control_msg(udev, 1, init[cam->method][i].value,
@@ -668,22 +666,23 @@ static int zr364xx_open(struct inode *inode, struct file *file)
 				     init[cam->method][i].size);
 		if (err < 0) {
 			info("error during open sequence: %d", i);
-			mutex_unlock(&cam->lock);
-			unlock_kernel();
-			return err;
+			goto out;
 		}
 	}
 
+	cam->skip = 2;
+	cam->users++;
 	file->private_data = vdev;
 
 	/* Added some delay here, since opening/closing the camera quickly,
 	 * like Ekiga does during its startup, can crash the webcam
 	 */
 	mdelay(100);
+	err = 0;
 
+out:
 	mutex_unlock(&cam->lock);
-	unlock_kernel();
-	return 0;
+	return err;
 }
 
 
@@ -704,6 +703,10 @@ static int zr364xx_release(struct inode *inode, struct file *file)
 	udev = cam->udev;
 
 	mutex_lock(&cam->lock);
+
+	cam->users--;
+	file->private_data = NULL;
+
 	for (i = 0; i < 2; i++) {
 		err =
 		    send_control_msg(udev, 1, init[cam->method][i].value,
@@ -711,21 +714,19 @@ static int zr364xx_release(struct inode *inode, struct file *file)
 				     init[cam->method][i].size);
 		if (err < 0) {
 			info("error during release sequence");
-			mutex_unlock(&cam->lock);
-			return err;
+			goto out;
 		}
 	}
 
-	file->private_data = NULL;
-	video_exclusive_release(inode, file);
-
 	/* Added some delay here, since opening/closing the camera quickly,
 	 * like Ekiga does during its startup, can crash the webcam
 	 */
 	mdelay(100);
+	err = 0;
 
+out:
 	mutex_unlock(&cam->lock);
-	return 0;
+	return err;
 }