From 36afe8b14e893f800e5d138263308e48a1e14e44 Mon Sep 17 00:00:00 2001
From: Andrew Lunn <andrew@lunn.ch>
Date: Wed, 11 Mar 2020 21:02:31 +0100
Subject: [PATCH] net: dsa: mv88e6xxx: Add missing mask of ATU occupancy
 register

[ Upstream commit 012fc74517b25177dfede2ed45cd108258564e4a ]

Only the bottom 12 bits contain the ATU bin occupancy statistics. The
upper bits need masking off.

Fixes: e0c69ca7dfbb ("net: dsa: mv88e6xxx: Add ATU occupancy via devlink resources")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 3bd988529178..5f88effeb17a 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2762,6 +2762,8 @@ static u64 mv88e6xxx_devlink_atu_bin_get(struct mv88e6xxx_chip *chip,
 		goto unlock;
 	}
 
+	occupancy &= MV88E6XXX_G2_ATU_STATS_MASK;
+
 unlock:
 	mv88e6xxx_reg_unlock(chip);
 
-- 
2.43.0