From: Julia Lawall <julia.lawall@lip6.fr>
To: Markus Elfring <Markus.Elfring@web.de>
Cc: Wen Yang <wen.yang99@zte.com.cn>,
Gilles Muller <Gilles.Muller@lip6.fr>,
Nicolas Palix <nicolas.palix@imag.fr>,
Michal Marek <michal.lkml@markovi.net>,
Yi Wang <wang.yi59@zte.com.cn>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Wen Yang <yellowriver2010@hotmail.com>,
Cheng Shengyu <cheng.shengyu@zte.com.cn>,
cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: Re: [PATCH v5] Coccinelle: semantic code search for missing put_device()
Date: Fri, 15 Feb 2019 14:02:05 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.20.1902151400440.3617@hadrien> (raw)
In-Reply-To: <94e4b3e6-87a4-aea2-dfef-44d308f0fb4f@web.de>
[-- Attachment #1: Type: text/plain, Size: 963 bytes --]
On Fri, 15 Feb 2019, Markus Elfring wrote:
> > +@search exists@
> > +local idexpression id;
> > +expression x,e,e1;
> > +position p1,p2;
> > +type T,T1,T2,T3;
> > +@@
> > +
> > +id = of_find_device_by_node@p1(x)
> > +... when != e = id
> > +if (id == NULL || ...) { ... return ...; }
> > +... when != put_device(&id->dev)
> …
> > + when != if (id) { ... put_device(&id->dev) ... }
> …
>
> I would interpret this SmPL code in the way that the if statement
> for the pointer check is “optional” in this line.
> Is it an extra and redundant SmPL specification when the reference
> release function could eventually be found just anywhere within
> an implementation?
The proposed when code is correct. It is not redundant, because it checks
for a particular control-flow pattern.
julia
>
>
> Will a need evolve to develop a similar source code search approach
> for safer resource management with other function combinations?
>
> Regards,
> Markus
>
next prev parent reply other threads:[~2019-02-15 13:02 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-15 7:55 [PATCH v5] coccinelle: semantic code search for missing put_device() Wen Yang
2019-02-15 9:10 ` Markus Elfring
2019-02-15 12:52 ` [PATCH v5] Coccinelle: " Markus Elfring
2019-02-15 13:02 ` Julia Lawall [this message]
2019-02-15 13:15 ` [v5] " Markus Elfring
2019-02-15 13:15 ` Markus Elfring
2019-02-15 13:24 ` Julia Lawall
2019-02-15 13:54 ` Markus Elfring
2019-03-17 3:54 ` [PATCH v5] coccinelle: " Masahiro Yamada
2019-03-17 9:05 ` [v5] " Markus Elfring
2019-03-23 16:17 ` Markus Elfring
2019-03-26 6:54 ` Masahiro Yamada
2019-03-26 7:19 ` Julia Lawall
2019-03-26 9:14 ` Markus Elfring
2019-03-26 9:04 ` Markus Elfring
2019-03-26 9:52 ` Masahiro Yamada
2019-03-26 9:58 ` Julia Lawall
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