linux-kernel - [PATCH 8/13] drivers/pci/hotplug: Remove redundant test

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Message-ID: <Pine.LNX.4.64.0812211639170.9555@pc-004.diku.dk>
Date:	Sun, 21 Dec 2008 16:39:37 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 8/13] drivers/pci/hotplug: Remove redundant test

From: Julia Lawall <julia@...u.dk>

func is checked not to be NULL a few lines before.

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

// <smpl>
@r exists@
local idexpression x;
expression E;
position p1,p2;
@@

if (x@p1 == NULL || ...) { ... when forall
   return ...; }
... when != \(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\|&x\)
(
x@p2 == NULL
|
x@p2 != NULL
)

// another path to the test that is not through p1?
@s exists@
local idexpression r.x;
position r.p1,r.p2;
@@

... when != x@p1
(
x@p2 == NULL
|
x@p2 != NULL
)

@fix depends on !s@
position r.p1,r.p2;
expression x,E;
statement S1,S2;
@@

(
- if ((x@p2 != NULL) || ...)
  S1
|
- if ((x@p2 == NULL) && ...) S1
|
- BUG_ON(x@p2 == NULL);
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/pci/hotplug/cpqphp_ctrl.c   |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/hotplug/cpqphp_ctrl.c b/drivers/pci/hotplug/cpqphp_ctrl.c
index d947221..cc227a8 100644
--- a/drivers/pci/hotplug/cpqphp_ctrl.c
+++ b/drivers/pci/hotplug/cpqphp_ctrl.c
@@ -1954,7 +1954,7 @@ void cpqhp_pushbutton_thread(unsigned long slot)
 			return ;
 		}
 
-		if (func != NULL && ctrl != NULL) {
+		if (ctrl != NULL) {
 			if (cpqhp_process_SI(ctrl, func) != 0) {
 				amber_LED_on(ctrl, hp_slot);
 				green_LED_off(ctrl, hp_slot);
--
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