media: rcar-vin: Improve async notifier cleanup paths

The cleanup code for the async notifiers can be refactored to own
functions to reduce code duplication and improve readability. While at
it rename the CSI-2 initialization function _csi2_ instead of _mc_ to
match.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/rcar-vin/rcar-core.c

@@ -383,6 +383,16 @@ static void rvin_group_put(struct rvin_dev *vin)
 	kref_put(&group->refcount, rvin_group_release);
 }
 
+static void rvin_group_notifier_cleanup(struct rvin_dev *vin)
+{
+	mutex_lock(&vin->group->lock);
+	if (&vin->v4l2_dev == vin->group->notifier.v4l2_dev) {
+		v4l2_async_notifier_unregister(&vin->group->notifier);
+		v4l2_async_notifier_cleanup(&vin->group->notifier);
+	}
+	mutex_unlock(&vin->group->lock);
+}
+
 /* -----------------------------------------------------------------------------
  * Controls
  */
@@ -676,6 +686,12 @@ static int rvin_parallel_parse_of(struct rvin_dev *vin)
 	return ret;
 }
 
+static void rvin_parallel_cleanup(struct rvin_dev *vin)
+{
+	v4l2_async_notifier_unregister(&vin->notifier);
+	v4l2_async_notifier_cleanup(&vin->notifier);
+}
+
 static int rvin_parallel_init(struct rvin_dev *vin)
 {
 	int ret;
@@ -937,7 +953,16 @@ static int rvin_mc_parse_of_graph(struct rvin_dev *vin)
 	return 0;
 }
 
-static int rvin_mc_init(struct rvin_dev *vin)
+static void rvin_csi2_cleanup(struct rvin_dev *vin)
+{
+	if (!vin->info->use_mc)
+		return;
+
+	rvin_group_notifier_cleanup(vin);
+	rvin_group_put(vin);
+}
+
+static int rvin_csi2_init(struct rvin_dev *vin)
 {
 	int ret;
 
@@ -1449,7 +1474,7 @@ static int rcar_vin_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, vin);
 
 	if (vin->info->use_mc) {
-		ret = rvin_mc_init(vin);
+		ret = rvin_csi2_init(vin);
 		if (ret)
 			goto error_dma_unregister;
 	}
@@ -1462,20 +1487,9 @@ static int rcar_vin_probe(struct platform_device *pdev)
 	pm_runtime_enable(&pdev->dev);
 
 	return 0;
-
 error_group_unregister:
 	rvin_free_controls(vin);
-
-	if (vin->info->use_mc) {
-		mutex_lock(&vin->group->lock);
-		if (&vin->v4l2_dev == vin->group->notifier.v4l2_dev) {
-			v4l2_async_notifier_unregister(&vin->group->notifier);
-			v4l2_async_notifier_cleanup(&vin->group->notifier);
-		}
-		mutex_unlock(&vin->group->lock);
-		rvin_group_put(vin);
-	}
-
+	rvin_csi2_cleanup(vin);
 error_dma_unregister:
 	rvin_dma_unregister(vin);
 
@@ -1490,14 +1504,9 @@ static int rcar_vin_remove(struct platform_device *pdev)
 
 	rvin_v4l2_unregister(vin);
 
-	v4l2_async_notifier_unregister(&vin->notifier);
-	v4l2_async_notifier_cleanup(&vin->notifier);
+	rvin_parallel_cleanup(vin);
 
-	if (vin->info->use_mc) {
-		v4l2_async_notifier_unregister(&vin->group->notifier);
-		v4l2_async_notifier_cleanup(&vin->group->notifier);
-		rvin_group_put(vin);
-	}
+	rvin_csi2_cleanup(vin);
 
 	rvin_free_controls(vin);