linux-kernel - [PATCH 5.5 331/367] net: stmmac: xgmac: fix incorrect XGMAC_VLAN

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Date:   Mon, 10 Feb 2020 04:34:04 -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, Ong Boon Leong <boon.leong.ong@...el.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.5 331/367] net: stmmac: xgmac: fix incorrect XGMAC_VLAN_TAG register writting

From: Ong Boon Leong <boon.leong.ong@...el.com>

[ Upstream commit 907a076881f171254219faad05f46ac5baabedfb ]

We should always do a read of current value of XGMAC_VLAN_TAG instead of
directly overwriting the register value.

Fixes: 3cd1cfcba26e2 ("net: stmmac: Implement VLAN Hash Filtering in XGMAC")
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 |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
@@ -569,7 +569,9 @@ static void dwxgmac2_update_vlan_hash(st
 
 		writel(value, ioaddr + XGMAC_PACKET_FILTER);
 
-		value = XGMAC_VLAN_VTHM | XGMAC_VLAN_ETV;
+		value = readl(ioaddr + XGMAC_VLAN_TAG);
+
+		value |= XGMAC_VLAN_VTHM | XGMAC_VLAN_ETV;
 		if (is_double) {
 			value |= XGMAC_VLAN_EDVLP;
 			value |= XGMAC_VLAN_ESVL;
@@ -584,7 +586,9 @@ static void dwxgmac2_update_vlan_hash(st
 
 		writel(value, ioaddr + XGMAC_PACKET_FILTER);
 
-		value = XGMAC_VLAN_ETV;
+		value = readl(ioaddr + XGMAC_VLAN_TAG);
+
+		value |= XGMAC_VLAN_ETV;
 		if (is_double) {
 			value |= XGMAC_VLAN_EDVLP;
 			value |= XGMAC_VLAN_ESVL;