linux-kernel - Re: [PATCH v7 01/12] rpmsg: char: Export eptdev create an destroy functions

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Message-ID: <YapIzuCJFgMVamoI@ripper>
Date:   Fri, 3 Dec 2021 08:41:50 -0800
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>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com, julien.massot@....bzh
Subject: Re: [PATCH v7 01/12] rpmsg: char: Export eptdev create an destroy
 functions

On Fri 03 Dec 08:37 PST 2021, Arnaud POULIQUEN wrote:
> On 12/3/21 3:17 AM, Bjorn Andersson wrote:
> > On Mon 08 Nov 08:19 CST 2021, Arnaud Pouliquen wrote:
[..]
> >> +static inline int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent,
> >> +					     struct rpmsg_channel_info chinfo)
> >> +{
> >> +	/* This shouldn't be possible */
> > 
> > But isn't it very much possible that userspace invokes this function
> > through the ioctl that you move to the separate rpmsg_ctrl driver?
> > 
> >> +	WARN_ON(1);
> > 
> > Which would mean that this will spam the kernel with stack dumps.
> 
> Good catch, I will suppress the WARM_ON. I propose also to return -ENXIO
> instead of -EINVAL to be aligned with other functions in rpmsg.h
> 

ENXIO sounds better than EINVAL, let's go with that.

Thanks,
Bjorn