media: rkisp1: resizer: Fix and simplify (un)registration

The rkisp1_rsz_register() and rkisp1_rsz_unregister() functions don't
destroy the mutex (in the error path for the former). Fix this, simplify
error handling at registration time as media_entity_cleanup() can be
called on an uninitialized entity, and make rkisp1_rsz_unregister() and
rkisp1_resizer_devs_unregister() safe to be called on an unregistered
resizer subdev to prepare for simplification of error handling at probe
time.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Dafna Hirschfeld <dafna@fastmail.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c

@@ -782,8 +782,12 @@ static const struct v4l2_subdev_ops rkisp1_rsz_ops = {
 
 static void rkisp1_rsz_unregister(struct rkisp1_resizer *rsz)
 {
+	if (!rsz->rkisp1)
+		return;
+
 	v4l2_device_unregister_subdev(&rsz->sd);
 	media_entity_cleanup(&rsz->sd.entity);
+	mutex_destroy(&rsz->ops_lock);
 }
 
 static int rkisp1_rsz_register(struct rkisp1_resizer *rsz)
@@ -821,47 +825,43 @@ static int rkisp1_rsz_register(struct rkisp1_resizer *rsz)
 	mutex_init(&rsz->ops_lock);
 	ret = media_entity_pads_init(&sd->entity, RKISP1_RSZ_PAD_MAX, pads);
 	if (ret)
-		return ret;
+		goto error;
 
 	ret = v4l2_device_register_subdev(&rsz->rkisp1->v4l2_dev, sd);
 	if (ret) {
 		dev_err(sd->dev, "Failed to register resizer subdev\n");
-		goto err_cleanup_media_entity;
+		goto error;
 	}
 
 	rkisp1_rsz_init_config(sd, &state);
 	return 0;
 
-err_cleanup_media_entity:
+error:
 	media_entity_cleanup(&sd->entity);
-
+	mutex_destroy(&rsz->ops_lock);
 	return ret;
 }
 
 int rkisp1_resizer_devs_register(struct rkisp1_device *rkisp1)
 {
-	struct rkisp1_resizer *rsz;
-	unsigned int i, j;
+	unsigned int i;
 	int ret;
 
 	for (i = 0; i < ARRAY_SIZE(rkisp1->resizer_devs); i++) {
-		rsz = &rkisp1->resizer_devs[i];
+		struct rkisp1_resizer *rsz = &rkisp1->resizer_devs[i];
+
 		rsz->rkisp1 = rkisp1;
 		rsz->id = i;
+
 		ret = rkisp1_rsz_register(rsz);
-		if (ret)
-			goto err_unreg_resizer_devs;
+		if (ret) {
+			rsz->rkisp1 = NULL;
+			rkisp1_resizer_devs_unregister(rkisp1);
+			return ret;
+		}
 	}
 
 	return 0;
-
-err_unreg_resizer_devs:
-	for (j = 0; j < i; j++) {
-		rsz = &rkisp1->resizer_devs[j];
-		rkisp1_rsz_unregister(rsz);
-	}
-
-	return ret;
 }
 
 void rkisp1_resizer_devs_unregister(struct rkisp1_device *rkisp1)