linux-kernel - [PATCH net v4 5/6] net: stmmac: xgmac: fix missing IFF_MULTICAST checki in dwxgmac2_set

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Date:   Wed,  5 Feb 2020 16:55:09 +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 5/6] net: stmmac: xgmac: fix missing IFF_MULTICAST checki in dwxgmac2_set_filter

From: "Tan, Tee Min" <tee.min.tan@...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: 0efedbf11f07a ("net: stmmac: xgmac: Fix XGMAC selftests")
Signed-off-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/dwxgmac2_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
index a0e67d178280..67b754a56288 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
@@ -458,7 +458,7 @@ static void dwxgmac2_set_filter(struct mac_device_info *hw,
 
 		for (i = 0; i < XGMAC_MAX_HASH_TABLE; i++)
 			writel(~0x0, ioaddr + XGMAC_HASH_TABLE(i));
-	} else if (!netdev_mc_empty(dev)) {
+	} else if (!netdev_mc_empty(dev) && (dev->flags & IFF_MULTICAST)) {
 		struct netdev_hw_addr *ha;
 
 		value |= XGMAC_FILTER_HMC;
-- 
2.17.1