linux-kernel - Re: [v4] coccinelle: semantic patch for missing put

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Message-ID: <alpine.DEB.2.21.1902150900270.2896@hadrien>
Date:   Fri, 15 Feb 2019 09:02:18 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Markus Elfring <Markus.Elfring@....de>
cc:     Wen Yang <wen.yang99@....com.cn>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Michal Marek <michal.lkml@...kovi.net>,
        Yi Wang <wang.yi59@....com.cn>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Wen Yang <yellowriver2010@...mail.com>,
        Cheng Shengyu <cheng.shengyu@....com.cn>,
        cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [v4] coccinelle: semantic patch for missing put_device()



On Fri, 15 Feb 2019, Markus Elfring wrote:

> >> So I plan to modify the following to capture both cases:
> >> -local idexpression id;
> >> +expression id;
> >
> > I'm not sure that this is a good idea.
>
> Why have you got doubts here?
>
>
> > There is likely no need for a put in the latter case.
>
> I have got understanding difficulties for such information.
> What did you try to express with this sentence finally?

The whole goal of the semantic patch is to ensure that put_device is
called when needed.  If the value is stored in a structure, then someone
else will likely take care of calling put_device later when the structure
is destroyed.

julia