netdev - [PATCH v5] net: mac802154: comparision issue of type cast, finding by EXTRA

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Date:	Thu, 25 Apr 2013 18:49:55 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	David Miller <davem@...emloft.net>
CC:	Daniel Borkmann <dborkman@...hat.com>,
	Christophe Aeschlimann <c.aeschlimann@...-group.ch>,
	sergei.shtylyov@...entembedded.com,
	alex.bluesman.smirnov@...il.com, dbaryshkov@...il.com,
	linux-zigbee-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: [PATCH v5] net: mac802154: comparision issue of type cast, finding
 by EXTRA_CFLAGS=-W


Change MAC802154_CHAN_NONE from ~(u8)0 to 0xff, or the comparison in
mac802154_wpan_xmit() for ``chan == MAC802154_CHAN_NONE'' will not
succeed.

This bug can be boiled down to ``u8 foo = 0xff; if (foo == ~(u8)0)
[...] else [...]'' where the condition will always take the else
branch. 

Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 net/mac802154/mac802154.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac802154/mac802154.h b/net/mac802154/mac802154.h
index a4dcaf1..703c121 100644
--- a/net/mac802154/mac802154.h
+++ b/net/mac802154/mac802154.h
@@ -90,7 +90,7 @@ struct mac802154_sub_if_data {
 
 #define MAC802154_MAX_XMIT_ATTEMPTS	3
 
-#define MAC802154_CHAN_NONE		(~(u8)0) /* No channel is assigned */
+#define MAC802154_CHAN_NONE		0xff /* No channel is assigned */
 
 extern struct ieee802154_reduced_mlme_ops mac802154_mlme_reduced;
 extern struct ieee802154_mlme_ops mac802154_mlme_wpan;
-- 
1.7.11.7
--
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