linux-kernel - Re: [PATCH v4 04/24] fpga: add device feature list support

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Date:   Thu, 22 Mar 2018 12:40:06 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     Alan Tull <atull@...nel.org>
Cc:     Moritz Fischer <mdf@...nel.org>, linux-fpga@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org, "Kang, Luwei" <luwei.kang@...el.com>,
        "Zhang, Yi Z" <yi.z.zhang@...el.com>,
        Tim Whisonant <tim.whisonant@...el.com>,
        Enno Luebbers <enno.luebbers@...el.com>,
        Shiva Rao <shiva.rao@...el.com>,
        Christopher Rauer <christopher.rauer@...el.com>,
        Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Subject: Re: [PATCH v4 04/24] fpga: add device feature list support

On Wed, Mar 21, 2018 at 06:54:58PM -0500, Alan Tull wrote:
> On Tue, Feb 13, 2018 at 3:24 AM, Wu Hao <hao.wu@...el.com> wrote:
> 
> Hi Hao,
> 
> > +static int
> > +build_info_create_dev(struct build_feature_devs_info *binfo,
> > +                     enum fpga_id_type type, const char *name,
> > +                     void __iomem *ioaddr)
> > +{
> > +       struct platform_device *fdev;
> > +       int ret;
> > +
> > +       /* we will create a new device, commit current device first */
> > +       ret = build_info_commit_dev(binfo);
> > +       if (ret)
> > +               return ret;
> > +
> > +       /*
> > +        * we use -ENODEV as the initialization indicator which indicates
> > +        * whether the id need to be reclaimed
> > +        */
> > +       fdev = platform_device_alloc(name, -ENODEV);
> > +       if (!fdev)
> > +               return -ENOMEM;
> > +
> > +       binfo->feature_dev = fdev;
> > +       binfo->feature_num = 0;
> > +       binfo->ioaddr = ioaddr;
> > +       INIT_LIST_HEAD(&binfo->sub_features);
> > +
> > +       fdev->id = alloc_fpga_id(type, &fdev->dev);
> > +       if (fdev->id < 0)
> > +               return fdev->id;
> 
> Do we need platform_device_put if returning here?

Hi Alan,

Actually if any error returned by this build_info_create_dev, it will cause
parse_feature_list returns error code and finally build_info_free is invoked.
In build_info_free function, it will do platform_device_put there, so we don't
have to add code to do put here. : )

Thanks
Hao

> 
> Alan
> 
> > +
> > +       fdev->dev.parent = &binfo->cdev->region.dev;
> > +
> > +       return 0;
> > +}
> > +