[PATCH net v5 3/5] net: stmmac: fix missing IFF_MULTICAST check in dwmac4_set_filter

From: Ong Boon Leong
Date: Fri Feb 07 2020 - 02:34:33 EST


From: "Verma, Aashish" <aashishx.verma@xxxxxxxxx>

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
command:-
ip link set <devname> multicast off|on

Fixes: 477286b53f55 ("stmmac: add GMAC4 core support")
Signed-off-by: Verma, Aashish <aashishx.verma@xxxxxxxxx>
Tested-by: Tan, Tee Min <tee.min.tan@xxxxxxxxx>
Signed-off-by: Ong Boon Leong <boon.leong.ong@xxxxxxxxx>
---
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 4d8eef9ff137..dc09d2131e40 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,
value |= GMAC_PACKET_FILTER_PM;
/* 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 */
--
2.17.1