The branches are dead code. even when dev->flag IFF_MULTICAST (defined 0x1000)
is set, dev->flags & IFF_MULTICAST & [boolean] always evaluates to 0.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
diff --git a/drivers/net/ipg.c b/drivers/net/ipg.c
index 9b358f6..679a082 100644
--- a/drivers/net/ipg.c
+++ b/drivers/net/ipg.c
@@ -577,12 +577,12 @@ static void ipg_nic_set_multicast_list(struct net_device *dev)
 		/* NIC to be configured in promiscuous mode. */
 		receivemode = IPG_RM_RECEIVEALLFRAMES;
 	} else if ((dev->flags & IFF_ALLMULTI) ||
-		   (dev->flags & IFF_MULTICAST &
+		   ((dev->flags & IFF_MULTICAST) &&
 		    (dev->mc_count > IPG_MULTICAST_HASHTABLE_SIZE))) {
 		/* NIC to be configured to receive all multicast
 		 * frames. */
 		receivemode |= IPG_RM_RECEIVEMULTICAST;
-	} else if (dev->flags & IFF_MULTICAST & (dev->mc_count > 0)) {
+	} else if ((dev->flags & IFF_MULTICAST) && (dev->mc_count > 0)) {
 		/* NIC to be configured to receive selected
 		 * multicast addresses. */
 		receivemode |= IPG_RM_RECEIVEMULTICASTHASH;
--
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原文链接: http://lkml.org/lkml/2008/5/13/415
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