linux-kernel - Re: [PATCH v5 1/9] fpga: dfl: make init callback optional

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Date:   Wed, 21 Aug 2019 13:12:04 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     gregkh@...uxfoundation.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-doc@...r.kernel.org, atull@...nel.org
Subject: Re: [PATCH v5 1/9] fpga: dfl: make init callback optional

On Tue, Aug 20, 2019 at 08:24:06PM -0700, Moritz Fischer wrote:
> Hi,
> 
> On Mon, Aug 12, 2019 at 10:49:56AM +0800, Wu Hao wrote:
> > This patch makes init callback of sub features optional. With
> > this change, people don't need to prepare any empty init callback.
> > 
> > Signed-off-by: Wu Hao <hao.wu@...el.com>
> 
> Acked-by: Moritz Fischer <mdf@...nel.org>
> > ---
> >  drivers/fpga/dfl.c | 10 ++++++----
> >  1 file changed, 6 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
> > index c0512af..96a2b82 100644
> > --- a/drivers/fpga/dfl.c
> > +++ b/drivers/fpga/dfl.c
> > @@ -271,11 +271,13 @@ static int dfl_feature_instance_init(struct platform_device *pdev,
> >  				     struct dfl_feature *feature,
> >  				     struct dfl_feature_driver *drv)
> >  {
> > -	int ret;
> > +	int ret = 0;
> >  
> > -	ret = drv->ops->init(pdev, feature);
> > -	if (ret)
> > -		return ret;
> > +	if (drv->ops->init) {
> > +		ret = drv->ops->init(pdev, feature);
> > +		if (ret)
> > +			return ret;
> > +	}
> >  
> >  	feature->ops = drv->ops;
> 
> You could swap it around maybe like so:
> 
> int dfl_feature_instance_init() ...
> {
> 	feature->ops = drv->ops;
> 	if (drv->ops->init)
> 		return drv->ops->init(pdev, feature);
> 
> 	return 0;
> }
> 
> With the caveat that feature->ops gets always set ...
> 
> Your call.

Hi Moritz,

Thanks a lot for the review and comments. It does simplify the code,
will modify it.

Thanks
Hao

> 
> Thanks,
> Moritz