linux-kernel - Re: [PATCH v2 10/16] rpmsg: char: allow only one endpoint per device

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Date:   Mon, 4 Jan 2021 18:59:50 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        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 v2 10/16] rpmsg: char: allow only one endpoint per device

On Tue 22 Dec 04:57 CST 2020, Arnaud Pouliquen wrote:

> Only one endpoint can be created per device, prevent from multi open.
> 

Having multiple invocations of rpmsg_create_ept() with the same chinfo
sounds like a bad idea. I think in the SMD and GLINK case the underlying
transport would complain that the related chinfo is already "busy", but
this seems like an appropriate fix regardless.

Please add a proper Fixes: tag and send this outside of this patch
series.

Thanks,
Bjorn

> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
> ---
>  drivers/rpmsg/rpmsg_char.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
> index 66e01b979e72..4b0674a2e3e9 100644
> --- a/drivers/rpmsg/rpmsg_char.c
> +++ b/drivers/rpmsg/rpmsg_char.c
> @@ -122,6 +122,9 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
>  	struct rpmsg_device *rpdev = eptdev->rpdev;
>  	struct device *dev = &eptdev->dev;
>  
> +	if (eptdev->ept)
> +		return -EBUSY;
> +
>  	get_device(dev);
>  
>  	ept = rpmsg_create_ept(rpdev, rpmsg_ept_cb, eptdev, eptdev->chinfo);
> -- 
> 2.17.1
>