linux-kernel - Re: [PATCH v4 11/12] fpga: dfl: fme: add global error reporting support

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Date:   Wed, 7 Aug 2019 16:08:25 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-doc@...r.kernel.org, atull@...nel.org,
        Luwei Kang <luwei.kang@...el.com>,
        Ananda Ravuri <ananda.ravuri@...el.com>,
        Xu Yilun <yilun.xu@...el.com>
Subject: Re: [PATCH v4 11/12] fpga: dfl: fme: add global error reporting
 support

On Wed, Aug 07, 2019 at 10:45:22AM +0800, Wu Hao wrote:
> On Mon, Aug 05, 2019 at 05:56:26PM +0200, Greg KH wrote:
> > On Sun, Aug 04, 2019 at 06:20:21PM +0800, Wu Hao wrote:
> > > +static int fme_global_err_init(struct platform_device *pdev,
> > > +			       struct dfl_feature *feature)
> > > +{
> > > +	struct device *dev;
> > > +	int ret = 0;
> > > +
> > > +	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
> > > +	if (!dev)
> > > +		return -ENOMEM;
> > > +
> > > +	dev->parent = &pdev->dev;
> > > +	dev->release = err_dev_release;
> > > +	dev_set_name(dev, "errors");
> > > +
> > > +	fme_error_enable(feature);
> > > +
> > > +	ret = device_register(dev);
> > > +	if (ret) {
> > > +		put_device(dev);
> > > +		return ret;
> > > +	}
> > > +
> > > +	ret = device_add_groups(dev, error_groups);
> > 
> > cute, but no, you do not create a whole struct device for a subdir.  Use
> > the attribute group name like you did on earlier patches.
> 
> Sure, let me fix it in the next version.
> 
> > 
> > And again, you raced userspace and lost :(
> 
> Same here, could you please give some more hints here?

Oh.. I see..

I should follow [1] as this is a platform driver. I will fix it. Thanks!

[PATCH 00/11] Platform drivers, provide a way to add sysfs groups easily

[1]https://lkml.org/lkml/2019/7/4/181

Hao

> 
> Thanks in advance.
> Hao
> 
> > 
> > thanks,
> > 
> > greg k-h