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

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Message-ID: <de4db82c-8136-6fe7-f17a-59d65e8b266c@foss.st.com>
Date:   Fri, 5 Mar 2021 11:46:47 +0100
From:   Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
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 3/4/21 7:55 PM, Mathieu Poirier wrote:
> 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?

This keep the legacy hierarchy:
https://elixir.bootlin.com/linux/latest/source/drivers/rpmsg/rpmsg_char.c#L362

Thanks,
Arnaud


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