[PATCH net 6/7] net: stmmac: fix missing IFF_MULTICAST check in dwmac4_set_filter

Ong Boon Leong boon.leong.ong at intel.com
Mon Jan 13 18:01:15 PST 2020

From: "Verma, Aashish" <aashishx.verma at intel.com>

Without checking for IFF_MULTICAST flag, it is wrong to assume multicast
filtering is always enabled. By checking against IFF_MULTICAST, now
the driver behaves correctly when the multicast support is toggled by below

  ip link set <devname> multicast off|on

Fixes: 477286b53f55 ("stmmac: add GMAC4 core support")

Signed-off-by: Verma, Aashish <aashishx.verma at intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong at intel.com>
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index 6e3d0ab..53be936 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -420,7 +420,7 @@ static void dwmac4_set_filter(struct mac_device_info *hw,
 		/* Set all the bits of the HASH tab */
 		memset(mc_filter, 0xff, sizeof(mc_filter));
-	} else if (!netdev_mc_empty(dev)) {
+	} else if (!netdev_mc_empty(dev) && (dev->flags & IFF_MULTICAST)) {
 		struct netdev_hw_addr *ha;
 		/* Hash filter for multicast */

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