From 2c1bbbffa0b644fab4f91878cde0c2e8f52e2dcc Mon Sep 17 00:00:00 2001 From: Chen Gang Date: Thu, 25 Apr 2013 00:49:55 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- 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 a4dcaf1dd4b6..703c1210d223 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; -- 2.20.1