linux-kernel - [PATCH net v4 4/6] net: stmmac: fix missing IFF_MULTICAST check in dwmac4_set

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Date:   Wed,  5 Feb 2020 16:55:08 +0800
From:   Ong Boon Leong <boon.leong.ong@...el.com>
To:     netdev@...r.kernel.org
Cc:     Tan Tee Min <tee.min.tan@...el.com>,
        Voon Weifeng <weifeng.voon@...el.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Arnd Bergmann <arnd@...db.de>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net v4 4/6] net: stmmac: fix missing IFF_MULTICAST check in dwmac4_set_filter

From: "Verma, Aashish" <aashishx.verma@...el.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
command:-
  ip link set <devname> multicast off|on

Fixes: 477286b53f55 ("stmmac: add GMAC4 core support")
Signed-off-by: Verma, Aashish <aashishx.verma@...el.com>
Tested-by: Tan, Tee Min <tee.min.tan@...el.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.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 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