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Cc:     Allison Randal <allison@lohutok.net>,
        Armijn Hemel <armijn@tjaldur.nl>,
        Cheng Shengyu <cheng.shengyu@zte.com.cn>,
        "David S. Miller" <davem@davemloft.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
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References: <1562566745-7447-2-git-send-email-wen.yang99@zte.com.cn>
Subject: Re: Coccinelle: Checking the deletion of duplicate of_node_put()
 calls with SmPL
To:     Wen Yang <wen.yang99@zte.com.cn>,
        Julia Lawall <julia.lawall@lip6.fr>,
        Coccinelle <cocci@systeme.lip6.fr>
From:   Markus Elfring <Markus.Elfring@web.de>
Openpgp: preference=signencrypt
Autocrypt: addr=Markus.Elfring@web.de; prefer-encrypt=mutual; keydata=
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Date:   Tue, 9 Jul 2019 14:14:48 +0200
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> 110:	ierr_out:

> 111:		of_node_put(trng);  ---> double released here

> ...


>
> This issue was detected by using the Coccinelle software.

Such a detection of a questionable source code place can be nice and helpf=
ul.

I constructed another script variant for the semantic patch language.

@deletion@
expression x;
identifier target;
@@
 of_node_put(x);
 if (...)
    goto target;
 ... when any
 target:
-of_node_put(x);


I observe then that this adjustment approach can generate the desired patc=
h
for a source code extract.

elfring@Sonne:~/Projekte/Coccinelle/Probe> spatch ../janitor/delete_duplic=
ate_of_node_put1.cocci crypto4xx_trng-excerpt1.c

=E2=80=A6
-	of_node_put(trng);

=E2=80=A6


But I wonder at the moment why it does not work (as expected) for the orig=
inal
complete source file.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/dr=
ivers/crypto/amcc/crypto4xx_trng.c?id=3D5ad18b2e60b75c7297a998dea702451d33=
a052ed#n71
https://elixir.bootlin.com/linux/v5.2/source/drivers/crypto/amcc/crypto4xx=
_trng.c#L71

I am curious on further software development ideas.

Regards,
Markus