linux-kernel - Re: [PATCH linux-next] media:cdns-csi2tx: replace of_node_put() with _

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Message-ID: <6df5d715-3e31-40a5-9db3-2c3b9f12efac@wanadoo.fr>
Date: Mon, 29 Apr 2024 20:40:59 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: R Sundar <prosunofficial@...il.com>, mripard@...nel.org,
 mchehab@...nel.org
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 skhan@...uxfoundation.org, javier.carrasco.cruz@...il.com,
 Julia Lawall <julia.lawall@...ia.fr>
Subject: Re: [PATCH linux-next] media:cdns-csi2tx: replace of_node_put() with
 __free

Le 29/04/2024 à 19:15, R Sundar a écrit :
> Use the new cleanup magic to replace of_node_put() with
> __free(device_node) marking to auto release when they get out of scope.
> 
> Suggested-by: Julia Lawall <julia.lawall@...ia.fr>
> Signed-off-by: R Sundar <prosunofficial@...il.com>
> ---
>   drivers/media/platform/cadence/cdns-csi2tx.c | 19 +++++++------------
>   1 file changed, 7 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/media/platform/cadence/cdns-csi2tx.c b/drivers/media/platform/cadence/cdns-csi2tx.c
> index 3d98f91f1bee..88aed2f299fd 100644
> --- a/drivers/media/platform/cadence/cdns-csi2tx.c
> +++ b/drivers/media/platform/cadence/cdns-csi2tx.c
> @@ -496,48 +496,43 @@ static int csi2tx_get_resources(struct csi2tx_priv *csi2tx,
>   static int csi2tx_check_lanes(struct csi2tx_priv *csi2tx)
>   {
>   	struct v4l2_fwnode_endpoint v4l2_ep = { .bus_type = 0 };
> -	struct device_node *ep;
>   	int ret, i;
> -
> -	ep = of_graph_get_endpoint_by_regs(csi2tx->dev->of_node, 0, 0);
> +	struct device_node *ep __free(device_node) =
> +		of_graph_get_endpoint_by_regs(csi2tx->dev->of_node, 0, 0);
> +
>   	if (!ep)
>   		return -EINVAL;
>   
>   	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &v4l2_ep);
>   	if (ret) {
>   		dev_err(csi2tx->dev, "Could not parse v4l2 endpoint\n");
> -		goto out;
> +		return ret;
>   	}
>   
>   	if (v4l2_ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
>   		dev_err(csi2tx->dev, "Unsupported media bus type: 0x%x\n",
>   			v4l2_ep.bus_type);
> -		ret = -EINVAL;
> -		goto out;
> +		return -EINVAL;
>   	}
>   
>   	csi2tx->num_lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes;
>   	if (csi2tx->num_lanes > csi2tx->max_lanes) {
>   		dev_err(csi2tx->dev,
>   			"Current configuration uses more lanes than supported\n");
> -		ret = -EINVAL;
> -		goto out;
> +		return -EINVAL;
>   	}
>   
>   	for (i = 0; i < csi2tx->num_lanes; i++) {
>   		if (v4l2_ep.bus.mipi_csi2.data_lanes[i] < 1) {
>   			dev_err(csi2tx->dev, "Invalid lane[%d] number: %u\n",
>   				i, v4l2_ep.bus.mipi_csi2.data_lanes[i]);
> -			ret = -EINVAL;
> -			goto out;
> +			return -EINVAL;
>   		}
>   	}
>   
>   	memcpy(csi2tx->lanes, v4l2_ep.bus.mipi_csi2.data_lanes,
>   	       sizeof(csi2tx->lanes));
>   
> -out:
> -	of_node_put(ep);
>   	return ret;

Hi,

Nit: return 0; ?

CJ

>   }
>