V4L/DVB: radio-si470x: remove the BKL lock used internally at the driver

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/radio/si470x/radio-si470x-usb.c

@@ -517,7 +517,7 @@ int si470x_fops_open(struct file *file)
 	struct si470x_device *radio = video_drvdata(file);
 	int retval;
 
-	lock_kernel();
+	mutex_lock(&radio->lock);
 	radio->users++;
 
 	retval = usb_autopm_get_interface(radio->intf);
@@ -558,7 +558,7 @@ int si470x_fops_open(struct file *file)
 	}
 
 done:
-	unlock_kernel();
+	mutex_unlock(&radio->lock);
 	return retval;
 }
 
@@ -577,7 +577,7 @@ int si470x_fops_release(struct file *file)
 		goto done;
 	}
 
-	mutex_lock(&radio->disconnect_lock);
+	mutex_lock(&radio->lock);
 	radio->users--;
 	if (radio->users == 0) {
 		/* shutdown interrupt handler */
@@ -591,7 +591,7 @@ int si470x_fops_release(struct file *file)
 			video_unregister_device(radio->videodev);
 			kfree(radio->int_in_buffer);
 			kfree(radio->buffer);
-			mutex_unlock(&radio->disconnect_lock);
+			mutex_unlock(&radio->lock);
 			kfree(radio);
 			goto done;
 		}
@@ -603,7 +603,7 @@ int si470x_fops_release(struct file *file)
 		retval = si470x_stop(radio);
 		usb_autopm_put_interface(radio->intf);
 	}
-	mutex_unlock(&radio->disconnect_lock);
+	mutex_unlock(&radio->lock);
 done:
 	return retval;
 }
@@ -661,7 +661,6 @@ static int si470x_usb_driver_probe(struct usb_interface *intf,
 	radio->disconnected = 0;
 	radio->usbdev = interface_to_usbdev(intf);
 	radio->intf = intf;
-	mutex_init(&radio->disconnect_lock);
 	mutex_init(&radio->lock);
 
 	iface_desc = intf->cur_altsetting;
@@ -830,7 +829,7 @@ static void si470x_usb_driver_disconnect(struct usb_interface *intf)
 {
 	struct si470x_device *radio = usb_get_intfdata(intf);
 
-	mutex_lock(&radio->disconnect_lock);
+	mutex_lock(&radio->lock);
 	radio->disconnected = 1;
 	usb_set_intfdata(intf, NULL);
 	if (radio->users == 0) {
@@ -843,10 +842,10 @@ static void si470x_usb_driver_disconnect(struct usb_interface *intf)
 		kfree(radio->int_in_buffer);
 		video_unregister_device(radio->videodev);
 		kfree(radio->buffer);
-		mutex_unlock(&radio->disconnect_lock);
+		mutex_unlock(&radio->lock);
 		kfree(radio);
 	} else {
-		mutex_unlock(&radio->disconnect_lock);
+		mutex_unlock(&radio->lock);
 	}
 }
 

drivers/media/radio/si470x/radio-si470x.h

@@ -177,7 +177,6 @@ struct si470x_device {
 
 	/* driver management */
 	unsigned char disconnected;
-	struct mutex disconnect_lock;
 #endif
 
 #if defined(CONFIG_I2C_SI470X) || defined(CONFIG_I2C_SI470X_MODULE)