3 files changed, 13 insertions, 5 deletions

diff --git a/drivers/media/video/usbvision/usbvision-i2c.c b/drivers/media/video/usbvision/usbvision-i2c.c
index 42ba28785750..a5fd2aa3646e 100644
--- a/drivers/media/video/usbvision/usbvision-i2c.c
+++ b/drivers/media/video/usbvision/usbvision-i2c.c
@@ -211,6 +211,9 @@ int usbvision_i2c_register(struct usb_usbvision *usbvision)
 		0x42 >> 1, 0x40 >> 1,	/* SAA7114, SAA7115 and SAA7118 */
 		I2C_CLIENT_END };
 
+	if (usbvision->registered_i2c)
+		return 0;
+
 	memcpy(&usbvision->i2c_adap, &i2c_adap_template,
 	       sizeof(struct i2c_adapter));
 
@@ -268,6 +271,8 @@ int usbvision_i2c_register(struct usb_usbvision *usbvision)
 				&usbvision->i2c_adap, "tuner",
 				"tuner", 0, v4l2_i2c_tuner_addrs(type));
 
+		if (sd == NULL)
+			return -ENODEV;
 		if (usbvision->tuner_type != -1) {
 			tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
 			tun_setup.type = usbvision->tuner_type;
@@ -275,14 +280,18 @@ int usbvision_i2c_register(struct usb_usbvision *usbvision)
 			call_all(usbvision, tuner, s_type_addr, &tun_setup);
 		}
 	}
+	usbvision->registered_i2c = 1;
 
 	return 0;
 }
 
 int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
 {
+	if (!usbvision->registered_i2c)
+		return 0;
 
 	i2c_del_adapter(&(usbvision->i2c_adap));
+	usbvision->registered_i2c = 0;
 
 	PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name);
 
diff --git a/drivers/media/video/usbvision/usbvision-video.c b/drivers/media/video/usbvision/usbvision-video.c
index c2690df33438..db6b828594f5 100644
--- a/drivers/media/video/usbvision/usbvision-video.c
+++ b/drivers/media/video/usbvision/usbvision-video.c
@@ -357,7 +357,7 @@ static int usbvision_v4l2_open(struct file *file)
 
 	PDEBUG(DBG_IO, "open");
 
-	lock_kernel();
+	mutex_lock(&usbvision->lock);
 	usbvision_reset_powerOffTimer(usbvision);
 
 	if (usbvision->user)
@@ -379,7 +379,6 @@ static int usbvision_v4l2_open(struct file *file)
 
 	/* If so far no errors then we shall start the camera */
 	if (!errCode) {
-		mutex_lock(&usbvision->lock);
 		if (usbvision->power == 0) {
 			usbvision_power_on(usbvision);
 			usbvision_i2c_register(usbvision);
@@ -408,14 +407,13 @@ static int usbvision_v4l2_open(struct file *file)
 				usbvision->initialized = 0;
 			}
 		}
-		mutex_unlock(&usbvision->lock);
 	}
 
 	/* prepare queues */
 	usbvision_empty_framequeues(usbvision);
 
 	PDEBUG(DBG_IO, "success");
-	unlock_kernel();
+	mutex_unlock(&usbvision->lock);
 	return errCode;
 }
 
@@ -1645,8 +1643,8 @@ static int __devinit usbvision_probe(struct usb_interface *intf,
 	usbvision->usb_bandwidth = 0;
 	usbvision->user = 0;
 	usbvision->streaming = Stream_Off;
-	usbvision_register_video(usbvision);
 	usbvision_configure_video(usbvision);
+	usbvision_register_video(usbvision);
 	mutex_unlock(&usbvision->lock);
 
 	usbvision_create_sysfs(usbvision->vdev);
diff --git a/drivers/media/video/usbvision/usbvision.h b/drivers/media/video/usbvision/usbvision.h
index d1b3cc0cd87f..cc4e96c8cd6c 100644
--- a/drivers/media/video/usbvision/usbvision.h
+++ b/drivers/media/video/usbvision/usbvision.h
@@ -363,6 +363,7 @@ struct usb_usbvision {
 
 	/* i2c Declaration Section*/
 	struct i2c_adapter i2c_adap;
+	int registered_i2c;
 
 	struct urb *ctrlUrb;
 	unsigned char ctrlUrbBuffer[8];