ethernet/ixp4xx: prevent allmulti from clobbering promisc

If both promisc and allmulti are set, promisc should trump allmulti and
disable the MAC filter; otherwise, the interface is not really promisc.

Previously, this code checked IFF_ALLMULTI prior to and without regard for
IFF_PROMISC; if both were set, only multicast and direct unicast traffic
would make it through the filter.

Signed-off-by: Derrick Pallas <pallas@meraki.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/xscale/ixp4xx_eth.c b/drivers/net/ethernet/xscale/ixp4xx_eth.c
index f7e0f0f..9e16a28 100644 (file)
--- a/drivers/net/ethernet/xscale/ixp4xx_eth.c
+++ b/drivers/net/ethernet/xscale/ixp4xx_eth.c
@@ -938,7 +938,7 @@ static void eth_set_mcast_list(struct net_device *dev)
        int i;
        static const u8 allmulti[] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 };
 
-       if (dev->flags & IFF_ALLMULTI) {
+       if ((dev->flags & IFF_ALLMULTI) && !(dev->flags & IFF_PROMISC)) {
                for (i = 0; i < ETH_ALEN; i++) {
                        __raw_writel(allmulti[i], &port->regs->mcast_addr[i]);
                        __raw_writel(allmulti[i], &port->regs->mcast_mask[i]);