From: Julia Lawall <julia@diku.dk>
Date: Sun, 12 Jul 2009 20:05:03 +0000 (+0200)
Subject: drivers/isdn: Drop unnecessary NULL test
X-Git-Tag: v2.6.32-rc1~703^2~545^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3cad3da3ed9ece03704f7d67e038b8ae710fa312;p=pandora-kernel.git

drivers/isdn: Drop unnecessary NULL test

The result of container_of should not be NULL.  In particular, in this case
the argument to the enclosing function has passed though INIT_WORK, which
dereferences it, implying that its container cannot be NULL.

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

// <smpl>
@@
identifier fn,work,x,fld;
type T;
expression E1,E2;
statement S;
@@

static fn(struct work_struct *work) {
  ... when != work = E1
  x = container_of(work,T,fld)
  ... when != x = E2
- if (x == NULL) S
  ...
}
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Karsten Keil <keil@b1-systems.de>
---

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