linux-kernel - Re: [PATCH v2 2/4] rpmsg: char: Introduce __rpmsg_chrdev_create

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Date:   Wed, 30 Jun 2021 14:38:59 -0600
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>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com, julien.massot@....bzh
Subject: Re: [PATCH v2 2/4] rpmsg: char: Introduce
 __rpmsg_chrdev_create_eptdev function

On Wed, Jun 23, 2021 at 05:05:02PM +0200, 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 channel 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 | 24 +++++++++++++++++++-----
>  1 file changed, 19 insertions(+), 5 deletions(-)
>

Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>

> diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
> index fbe10d527c5c..50b7d4b00175 100644
> --- a/drivers/rpmsg/rpmsg_char.c
> +++ b/drivers/rpmsg/rpmsg_char.c
> @@ -323,8 +323,9 @@ static void rpmsg_eptdev_release_device(struct device *dev)
>  	kfree(eptdev);
>  }
>  
> -int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent,
> -			       struct rpmsg_channel_info chinfo)
> +static struct rpmsg_eptdev *__rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev,
> +							 struct device *parent,
> +							 struct rpmsg_channel_info chinfo)
>  {
>  	struct rpmsg_eptdev *eptdev;
>  	struct device *dev;
> @@ -332,7 +333,7 @@ int rpmsg_chrdev_eptdev_create(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;
> @@ -374,9 +375,10 @@ int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent
>  	if (ret) {
>  		dev_err(dev, "device_add failed: %d\n", ret);
>  		put_device(dev);
> +		return ERR_PTR(ret);
>  	}
>  
> -	return ret;
> +	return eptdev;
>  
>  free_ept_ida:
>  	ida_simple_remove(&rpmsg_ept_ida, dev->id);
> @@ -386,7 +388,19 @@ int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent
>  	put_device(dev);
>  	kfree(eptdev);
>  
> -	return ret;
> +	return ERR_PTR(ret);
> +}
> +
> +int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent,
> +			       struct rpmsg_channel_info chinfo)
> +{
> +	struct rpmsg_eptdev *eptdev;
> +
> +	eptdev = __rpmsg_chrdev_eptdev_create(rpdev, parent, chinfo);
> +	if (IS_ERR(eptdev))
> +		return PTR_ERR(eptdev);
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL(rpmsg_chrdev_eptdev_create);
>  
> -- 
> 2.17.1
>