From: Julia Lawall <julia@diku.dk>
Date: Mon, 13 Jul 2009 20:43:41 +0000 (+0200)
Subject: ataflop: adjust NULL test
X-Git-Tag: v2.6.31-rc4~8^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f47428704c2fd6f787a6f340071b9c338b65803;p=pandora-kernel.git

ataflop: adjust NULL test

dtp is derefenced on the lines above the test !dtp, and so it cannot be
NULL at this point.

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

// <smpl>
@r@
expression x,E,E1;
identifier f,l;
position p1,p2;
@@

*x@p1->f = E1;
... when != x = E
    when != goto l;
(
*x@p2 == NULL
|
*x@p2 != NULL
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

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