linux-kernel - Re: [PATCH 2/2] fpga: dfl: create a dfl bus type to support DFL devices

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Message-ID: <20200721143918.GA20733@yilunxu-OptiPlex-7050>
Date:   Tue, 21 Jul 2020 22:39:18 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Tom Rix <trix@...hat.com>
Cc:     mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, lgoncalv@...hat.com,
        Wu Hao <hao.wu@...el.com>,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        Russ Weight <russell.h.weight@...el.com>
Subject: Re: [PATCH 2/2] fpga: dfl: create a dfl bus type to support DFL
  devices

> > +static int dfl_devs_init(struct platform_device *pdev)
> > +{
> > +	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
> > +	struct dfl_feature *feature;
> > +	struct dfl_device *dfl_dev;
> > +
> > +	dfl_fpga_dev_for_each_feature(pdata, feature) {
> > +		if (feature->ioaddr || feature->priv)
> > +			continue;
> > +
> > +		dfl_dev = dfl_dev_add(pdata, feature);
> > +		if (IS_ERR(dfl_dev)) {
> > +			dfl_devs_uinit(pdata);
> > +			return PTR_ERR(dfl_dev);
> What happens to dfl_dev's that were successful. Need a clean up ?

Yes, the already added dfl devices under this pdev will be unregistered
in function dfl_devs_uinit()

> > +		}
> > +
> > +		feature->priv = dfl_dev;
> > +	}
> > +
> > +	return 0;
> > +}