linux-kernel - Re: [PATCH v5 13/16] rpmsg: char: introduce __rpmsg_chrdev_create

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Date:   Thu, 4 Mar 2021 11:55:20 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Andy Gross <agross@...nel.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v5 13/16] rpmsg: char: introduce
 __rpmsg_chrdev_create_eptdev function

On Fri, Feb 19, 2021 at 12:14:58PM +0100, Arnaud Pouliquen wrote:
> Introduce the __rpmsg_chrdev_create_eptdev internal function that returns
> the rpmsg_eptdev context structure.
> This patch prepares the introduction of a RPMsg device for the
> char device. the RPMsg device will need a reference to the context.
> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
> ---
>  drivers/rpmsg/rpmsg_char.c | 23 ++++++++++++++++++-----
>  1 file changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
> index 09ae1304837c..66dcb8845d6c 100644
> --- a/drivers/rpmsg/rpmsg_char.c
> +++ b/drivers/rpmsg/rpmsg_char.c
> @@ -328,8 +328,9 @@ int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data)
>  }
>  EXPORT_SYMBOL(rpmsg_chrdev_eptdev_destroy);
>  
> -int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent,
> -			       struct rpmsg_channel_info chinfo)
> +static struct rpmsg_eptdev *__rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev,
> +							 struct device *parent,
> +							 struct rpmsg_channel_info chinfo)
>  {
>  	struct rpmsg_eptdev *eptdev;
>  	struct device *dev;
> @@ -337,7 +338,7 @@ int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent
>  
>  	eptdev = kzalloc(sizeof(*eptdev), GFP_KERNEL);
>  	if (!eptdev)
> -		return -ENOMEM;
> +		return ERR_PTR(-ENOMEM);
>  
>  	dev = &eptdev->dev;
>  	eptdev->rpdev = rpdev;
> @@ -381,7 +382,7 @@ int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent
>  		put_device(dev);
>  	}
>  
> -	return ret;
> +	return eptdev;
>  
>  free_ept_ida:
>  	ida_simple_remove(&rpmsg_ept_ida, dev->id);
> @@ -391,7 +392,19 @@ int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent
>  	put_device(dev);
>  	kfree(eptdev);
>  
> -	return ret;
> +	return ERR_PTR(ret);
> +}
> +
> +int rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent,
> +			       struct rpmsg_channel_info chinfo)
> +{
> +	struct rpmsg_eptdev *eptdev;
> +
> +	eptdev = __rpmsg_chrdev_create_eptdev(rpdev, &rpdev->dev, chinfo);

Shouldn't the second argument to __rpmsg_chrdev_create_eptdev() be @parent?

> +	if (IS_ERR(eptdev))
> +		return PTR_ERR(eptdev);
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL(rpmsg_chrdev_create_eptdev);
>  
> -- 
> 2.17.1
>