linux-kernel - [PATCH 4/9] arch/powerpc/platforms/powermac: Drop unnecessary null test

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Date:	Tue, 3 Aug 2010 23:33:43 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 4/9] arch/powerpc/platforms/powermac: Drop unnecessary null
 test

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

for_each_node_by_name binds its first argument to a non-null value, and
thus any null test on the value of that argument is superfluous.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
iterator I;
expression x,E;
@@

I(x,...) { <...
(
- (x != NULL) &&
  E
  ...> }
// </smpl>

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

---
 arch/powerpc/platforms/powermac/feature.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/powermac/feature.c b/arch/powerpc/platforms/powermac/feature.c
index 9e1b9fd..537957b 100644
--- a/arch/powerpc/platforms/powermac/feature.c
+++ b/arch/powerpc/platforms/powermac/feature.c
@@ -2867,7 +2867,7 @@ set_initial_features(void)
 
 		/* Switch airport off */
 		for_each_node_by_name(np, "radio") {
-			if (np && np->parent == macio_chips[0].of_node) {
+			if (np->parent == macio_chips[0].of_node) {
 				macio_chips[0].flags |= MACIO_FLAG_AIRPORT_ON;
 				core99_airport_enable(np, 0, 0);
 			}
--
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