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

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Date:   Mon, 5 Aug 2019 17:56:26 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Wu Hao <hao.wu@...el.com>
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 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.

And again, you raced userspace and lost :(

thanks,

greg k-h