linux-kernel - [PATCH 4/5] Coccinelle: put_device: Extend when constraints for two SmPL ellipses

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Message-ID: <82e10a38-b0c4-a6b3-11ab-08487f98188d@web.de>
Date:   Mon, 13 May 2019 11:07:14 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Julia Lawall <julia.lawall@...6.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Wen Yang <wen.yang99@....com.cn>
Cc:     cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org,
        Yi Wang <wang.yi59@....com.cn>
Subject: [PATCH 4/5] Coccinelle: put_device: Extend when constraints for two
 SmPL ellipses

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Mon, 13 May 2019 09:47:17 +0200

A SmPL ellipsis was specified for a search approach so that additional
source code would be tolerated between an assignment to a local variable
and the corresponding null pointer check.

But such code should be restricted.
* The local variable must not be reassigned there.
* It must also not be forwarded to an other assignment target.

Take additional casts for these code exclusion specifications into account
together with optional parentheses.

Link: https://lore.kernel.org/cocci/201902191014156680299@zte.com.cn/
Link: https://systeme.lip6.fr/pipermail/cocci/2019-February/005620.html
Fixes: da9cfb87a44da61f2403c4312916befcb6b6d7e8 ("coccinelle: semantic code search for missing put_device()")
Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 scripts/coccinelle/free/put_device.cocci | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/scripts/coccinelle/free/put_device.cocci b/scripts/coccinelle/free/put_device.cocci
index aae79c02c1e0..28b0be53fb3f 100644
--- a/scripts/coccinelle/free/put_device.cocci
+++ b/scripts/coccinelle/free/put_device.cocci
@@ -13,13 +13,15 @@ virtual org
 local idexpression id;
 expression x,e,e1;
 position p1,p2;
-type T,T1,T2,T3;
+type T,T1,T2,T3,T4,T5,T6;
 @@

 id = of_find_device_by_node@p1(x)
-... when != e = id
+ ... when != e = (T4)(id)
+     when != id = (T5)(e)
 if (id == NULL || ...) { ... return ...; }
 ... when != put_device(&id->dev)
+    when != id = (T6)(e)
     when != platform_device_put(id)
     when != of_dev_put(id)
     when != if (id) { ... put_device(&id->dev) ... }
--
2.21.0