linux-kernel - Re: [PATCH v4 2/3] rpmsg: char: Rework of rpmsg_eptdev

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Message-ID: <8371403c-668e-48ed-9df6-5d4c6d04fc66@oss.qualcomm.com>
Date: Wed, 19 Nov 2025 21:03:04 +0800
From: Zhongqiu Han <zhongqiu.han@....qualcomm.com>
To: Dawei Li <dawei.li@...ux.dev>, andersson@...nel.org,
        mathieu.poirier@...aro.org
Cc: linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        set_pte_at@...look.com, zhongqiu.han@....qualcomm.com
Subject: Re: [PATCH v4 2/3] rpmsg: char: Rework of rpmsg_eptdev_add() and its
 callers

On 11/18/2025 11:41 PM, Dawei Li wrote:
> For every caller of rpmsg_eptdev_add(), eptdev is allocated in
> rpmsg_eptdev_alloc(). Resource should be freed where it's allocated,
> In this case, eptdev should be freed in caller of rpmsg_eptdev_add() rather
> than rpmsg_eptdev_add() itself.
> 
> Move the error handling from rpmsg_eptdev_add() to its callers.
> 
> Fixes: 2410558f5f11 ("rpmsg: char: Implement eptdev based on anonymous inode")

Just for reference, it would be better if the commit message clearly
explained what is being fixed. Just like V3 2/3

https://lore.kernel.org/all/20251113153909.3789-3-dawei.li@linux.dev/


> Signed-off-by: Dawei Li <dawei.li@...ux.dev>
> ---
>   drivers/rpmsg/rpmsg_char.c | 26 +++++++++++++++-----------
>   1 file changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
> index 373b627581e8..56371899212f 100644
> --- a/drivers/rpmsg/rpmsg_char.c
> +++ b/drivers/rpmsg/rpmsg_char.c
> @@ -470,7 +470,7 @@ static int rpmsg_eptdev_add(struct rpmsg_eptdev *eptdev,
>   	if (cdev) {
>   		ret = ida_alloc_max(&rpmsg_minor_ida, RPMSG_DEV_MAX - 1, GFP_KERNEL);
>   		if (ret < 0)
> -			goto free_eptdev;
> +			return ret;
>   
>   		dev->devt = MKDEV(MAJOR(rpmsg_major), ret);
>   	}
> @@ -478,7 +478,7 @@ static int rpmsg_eptdev_add(struct rpmsg_eptdev *eptdev,
>   	/* Anonymous inode device still need device name for dev_err() and friends */
>   	ret = ida_alloc(&rpmsg_ept_ida, GFP_KERNEL);
>   	if (ret < 0)
> -		goto free_eptdev;
> +		return ret;
>   	dev->id = ret;
>   	dev_set_name(dev, "rpmsg%d", ret);
>   
> @@ -486,15 +486,8 @@ static int rpmsg_eptdev_add(struct rpmsg_eptdev *eptdev,
>   
>   	if (cdev) {
>   		ret = cdev_device_add(&eptdev->cdev, &eptdev->dev);
> -		if (ret)
> -			goto free_eptdev;
>   	}
>   
> -	return ret;
> -
> -free_eptdev:
> -	put_device(dev);
> -
>   	return ret;
>   }
>   
> @@ -507,12 +500,17 @@ int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent
>   			       struct rpmsg_channel_info chinfo)
>   {
>   	struct rpmsg_eptdev *eptdev;
> +	int ret;
>   
>   	eptdev = rpmsg_chrdev_eptdev_alloc(rpdev, parent);
>   	if (IS_ERR(eptdev))
>   		return PTR_ERR(eptdev);
>   
> -	return rpmsg_chrdev_eptdev_add(eptdev, chinfo);
> +	ret = rpmsg_chrdev_eptdev_add(eptdev, chinfo);
> +	if (ret)
> +		put_device(&eptdev->dev);
> +
> +	return ret;
>   }
>   EXPORT_SYMBOL(rpmsg_chrdev_eptdev_create);
>   
> @@ -544,6 +542,7 @@ int rpmsg_anonymous_eptdev_create(struct rpmsg_device *rpdev, struct device *par
>   	ret =  rpmsg_eptdev_add(eptdev, chinfo, false);
>   	if (ret) {
>   		dev_err(&eptdev->dev, "failed to add %s\n", eptdev->chinfo.name);
> +		put_device(&eptdev->dev);
>   		return ret;
>   	}
>   
> @@ -571,6 +570,7 @@ static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev)
>   	struct rpmsg_channel_info chinfo;
>   	struct rpmsg_eptdev *eptdev;
>   	struct device *dev = &rpdev->dev;
> +	int ret;
>   
>   	memcpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE);
>   	chinfo.src = rpdev->src;
> @@ -589,7 +589,11 @@ static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev)
>   	 */
>   	eptdev->default_ept->priv = eptdev;
>   
> -	return rpmsg_chrdev_eptdev_add(eptdev, chinfo);
> +	ret = rpmsg_chrdev_eptdev_add(eptdev, chinfo);
> +	if (ret)
> +		put_device(&eptdev->dev);
> +
> +	return ret;
>   }
>   
>   static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev)


-- 
Thx and BRs,
Zhongqiu Han