Thread (14 messages) 14 messages, 2 authors, 2024-05-30

Re: [PATCH v3 4/9] media: platform: microchip: use for_each_endpoint_of_node()

From: Dan Carpenter <hidden>
Date: 2024-05-30 06:37:40
Also in: dri-devel, linux-arm-kernel, linux-fbdev, linux-media, linux-omap

On Thu, May 30, 2024 at 02:06:05AM +0000, Kuninori Morimoto wrote:
quoted hunk ↗ jump to hunk
diff --git a/drivers/media/platform/microchip/microchip-sama5d2-isc.c b/drivers/media/platform/microchip/microchip-sama5d2-isc.c
index 5ac149cf3647f..60b6d922d764e 100644
--- a/drivers/media/platform/microchip/microchip-sama5d2-isc.c
+++ b/drivers/media/platform/microchip/microchip-sama5d2-isc.c
@@ -353,33 +353,29 @@ static const u32 isc_sama5d2_gamma_table[][GAMMA_ENTRIES] = {
 static int isc_parse_dt(struct device *dev, struct isc_device *isc)
 {
 	struct device_node *np = dev->of_node;
-	struct device_node *epn = NULL;
+	struct device_node *epn;
 	struct isc_subdev_entity *subdev_entity;
 	unsigned int flags;
-	int ret;
 
 	INIT_LIST_HEAD(&isc->subdev_entities);
 
-	while (1) {
+	for_each_endpoint_of_node(np, epn) {
 		struct v4l2_fwnode_endpoint v4l2_epn = { .bus_type = 0 };
-
-		epn = of_graph_get_next_endpoint(np, epn);
-		if (!epn)
-			return 0;
+		int ret;
 
 		ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(epn),
 						 &v4l2_epn);
 		if (ret) {
-			ret = -EINVAL;
+			of_node_put(epn);
 			dev_err(dev, "Could not parse the endpoint\n");
-			break;
+			return -EINVAL;
 		}
 
 		subdev_entity = devm_kzalloc(dev, sizeof(*subdev_entity),
 					     GFP_KERNEL);
 		if (!subdev_entity) {
-			ret = -ENOMEM;
-			break;
+			of_node_put(epn);
+			return -ENOMEM;
 		}
 		subdev_entity->epn = epn;
This code is an example of what Laurent was talking about.  We're taking
storing "subdev_entity->epn = epn" but then not incrementing the
refcount.  Perhaps it's not necessary?

The difference between this and _scoped() would be if we stored epn and
then returned.  I feel like that's less common.  We could detect that
sort of thing using static analysis if it turned out to be an issue.

regards,
dan carpenter
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