From: Julia Lawall <julia@diku.dk>
Date: Sun, 12 Jul 2009 07:42:47 +0000 (+0200)
Subject: HID: Drop NULL test on list_entry result
X-Git-Tag: v2.6.32-rc1~687^2~5
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3040c8203d68a9a0564af81729085054fd6b5b03;p=pandora-kernel.git

HID: Drop NULL test on list_entry result

list_entry, which is an alias for container_of, cannot return NULL, as
there is no way to add a NULL value to a doubly linked list.

A simplified version of the semantic match that findds this problem is as
follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r@
expression x,E;
statement S1,S2;
position p,p1;
@@

*x = list_entry@p(...)
... when != x = E
*if@p1 (x == NULL) S1 else S2
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---

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