linux-kernel - Re: [PATCH v2 4/7] rpmsg: char: Introduce __rpmsg_chrdev_create

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Date:   Wed, 21 Apr 2021 11:45:37 -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
Subject: Re: [PATCH v2 4/7] rpmsg: char: Introduce
 __rpmsg_chrdev_create_eptdev function

On Wed, Apr 21, 2021 at 11:43:29AM -0600, Mathieu Poirier wrote:
> On Tue, Apr 13, 2021 at 03:44:55PM +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>
> > 
> > ---
> > update from V1
> > - fix __rpmsg_chrdev_create_eptdev function header indentation.
> > 
> > ---
> >  drivers/rpmsg/rpmsg_char.c | 23 ++++++++++++++++++-----
> >  1 file changed, 18 insertions(+), 5 deletions(-)
> 
> Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
>

Please excuse the brain-bug here - this RB was destined to patch 3/7.  I am not sure
about this patch yet (see comment in 5/7).
 
> > 
> > diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
> > index 21ef9d9eccd7..a64249d83172 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_create_eptdev(struct rpmsg_device *rpdev, struct device *parent,
> > -			       struct rpmsg_channel_info chinfo, struct class *rpmsg_class)
> > +static struct rpmsg_eptdev *
> > +__rpmsg_chrdev_create_eptdev(struct rpmsg_device *rpdev, struct device *parent,
> > +			     struct rpmsg_channel_info chinfo, struct class *rpmsg_class)
> >  {
> >  	struct rpmsg_eptdev *eptdev;
> >  	struct device *dev;
> > @@ -332,7 +333,7 @@ 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;
> > @@ -376,7 +377,7 @@ 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);
> > @@ -386,7 +387,19 @@ 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 class *rpmsg_class)
> > +{
> > +	struct rpmsg_eptdev *eptdev;
> > +
> > +	eptdev = __rpmsg_chrdev_create_eptdev(rpdev, parent, chinfo, rpmsg_class);
> > +	if (IS_ERR(eptdev))
> > +		return PTR_ERR(eptdev);
> > +
> > +	return 0;
> >  }
> >  EXPORT_SYMBOL(rpmsg_chrdev_create_eptdev);
> >  
> > -- 
> > 2.17.1
> >