linux-kernel - Re: [PATCH v5 05/16] rpmsg: char: dissociate the control device from the rpmsg class

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Date:   Tue, 2 Mar 2021 11:01:11 -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 05/16] rpmsg: char: dissociate the control device from
 the rpmsg class

On Fri, Feb 19, 2021 at 12:14:50PM +0100, Arnaud Pouliquen wrote:
> The RPMsg control device is a RPMsg device, it is already
> referenced in the RPMsg bus. There is only an interest to
> reference the ept char devices in the rpmsg class.
> This patch prepares the code split of the control and end point
> devices in two separate files.
> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
> ---
>  drivers/rpmsg/rpmsg_char.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
> index 78a6d19fdf82..23e369a00531 100644
> --- a/drivers/rpmsg/rpmsg_char.c
> +++ b/drivers/rpmsg/rpmsg_char.c
> @@ -485,7 +485,6 @@ static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev)
>  	dev = &ctrldev->dev;
>  	device_initialize(dev);
>  	dev->parent = &rpdev->dev;
> -	dev->class = rpmsg_class;

This may break user space...  It has been around for so long that even if the
information is redundant we have to keep it.

>  
>  	cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops);
>  	ctrldev->cdev.owner = THIS_MODULE;
> -- 
> 2.17.1
>