linux-kernel - [PATCH AUTOSEL 5.3 10/99] net: dsa: b53: Do not clear existing mirrored port mask

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Message-Id: <20191026131600.2507-10-sashal@kernel.org>
Date:   Sat, 26 Oct 2019 09:14:31 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Hubert Feurstein <h.feurstein@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.3 10/99] net: dsa: b53: Do not clear existing mirrored port mask

From: Florian Fainelli <f.fainelli@...il.com>

[ Upstream commit c763ac436b668d7417f0979430ec0312ede4093d ]

Clearing the existing bitmask of mirrored ports essentially prevents us
from capturing more than one port at any given time. This is clearly
wrong, do not clear the bitmask prior to setting up the new port.

Reported-by: Hubert Feurstein <h.feurstein@...il.com>
Fixes: ed3af5fd08eb ("net: dsa: b53: Add support for port mirroring")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Reviewed-by: Vivien Didelot <vivien.didelot@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/dsa/b53/b53_common.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 907af62846ba8..0721c22e2bc8b 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1808,7 +1808,6 @@ int b53_mirror_add(struct dsa_switch *ds, int port,
 		loc = B53_EG_MIR_CTL;
 
 	b53_read16(dev, B53_MGMT_PAGE, loc, &reg);
-	reg &= ~MIRROR_MASK;
 	reg |= BIT(port);
 	b53_write16(dev, B53_MGMT_PAGE, loc, reg);
 
-- 
2.20.1