linux-kernel - [PATCH 5.5 333/367] net: stmmac: xgmac: fix missing IFF_MULTICAST checki in dwxgmac2_set

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Message-Id: <20200210122453.546037048@linuxfoundation.org>
Date:   Mon, 10 Feb 2020 04:34:06 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Tan, Tee Min" <tee.min.tan@...el.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.5 333/367] net: stmmac: xgmac: fix missing IFF_MULTICAST checki in dwxgmac2_set_filter

From: "Tan, Tee Min" <tee.min.tan@...el.com>

[ Upstream commit 2f633d5820e4ed870f408957322acb9263bce2f4 ]

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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 m
 
 		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;