linux-kernel - Re: [PATCH] media: rcar-csi2: Use common error handling code in rcsi2_parse

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Date: Fri, 1 Mar 2024 16:42:01 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Markus Elfring <Markus.Elfring@....de>,
	linux-renesas-soc@...r.kernel.org, linux-media@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Niklas Söderlund <niklas.soderlund@...natech.se>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: rcar-csi2: Use common error handling code in
 rcsi2_parse_dt()

Sakari Ailus pointed out in another thread that we could use __free()
instead.  Something like this:

diff --git a/drivers/media/platform/renesas/rcar-csi2.c b/drivers/media/platform/renesas/rcar-csi2.c
index 582d5e35db0e..c569df6057b7 100644
--- a/drivers/media/platform/renesas/rcar-csi2.c
+++ b/drivers/media/platform/renesas/rcar-csi2.c
@@ -1372,8 +1372,8 @@ static int rcsi2_parse_v4l2(struct rcar_csi2 *priv,
 static int rcsi2_parse_dt(struct rcar_csi2 *priv)
 {
 	struct v4l2_async_connection *asc;
-	struct fwnode_handle *fwnode;
-	struct fwnode_handle *ep;
+	struct fwnode_handle *fwnode __free(fwnode_handle) = NULL;
+	struct fwnode_handle *ep __free(fwnode_handle);
 	struct v4l2_fwnode_endpoint v4l2_ep = {
 		.bus_type = V4L2_MBUS_UNKNOWN,
 	};
@@ -1388,18 +1388,14 @@ static int rcsi2_parse_dt(struct rcar_csi2 *priv)
 	ret = v4l2_fwnode_endpoint_parse(ep, &v4l2_ep);
 	if (ret) {
 		dev_err(priv->dev, "Could not parse v4l2 endpoint\n");
-		fwnode_handle_put(ep);
 		return -EINVAL;
 	}
 
 	ret = rcsi2_parse_v4l2(priv, &v4l2_ep);
-	if (ret) {
-		fwnode_handle_put(ep);
+	if (ret)
 		return ret;
-	}
 
 	fwnode = fwnode_graph_get_remote_endpoint(ep);
-	fwnode_handle_put(ep);
 
 	dev_dbg(priv->dev, "Found '%pOF'\n", to_of_node(fwnode));
 
@@ -1408,7 +1404,6 @@ static int rcsi2_parse_dt(struct rcar_csi2 *priv)
 
 	asc = v4l2_async_nf_add_fwnode(&priv->notifier, fwnode,
 				       struct v4l2_async_connection);
-	fwnode_handle_put(fwnode);
 	if (IS_ERR(asc))
 		return PTR_ERR(asc);