linux-kernel - [PATCH 4.4 077/230] net: dsa: mv88e6xxx: Fix u64 statistics

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Message-Id: <20190322111242.064537869@linuxfoundation.org>
Date:   Fri, 22 Mar 2019 12:13:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chris Healy <Chris.Healy@....aero>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 077/230] net: dsa: mv88e6xxx: Fix u64 statistics

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrew Lunn <andrew@...n.ch>

[ Upstream commit 6e46e2d821bb22b285ae8187959096b65d063b0d ]

The switch maintains u64 counters for the number of octets sent and
received. These are kept as two u32's which need to be combined.  Fix
the combing, which wrongly worked on u16's.

Fixes: 80c4627b2719 ("dsa: mv88x6xxx: Refactor getting a single statistic")
Reported-by: Chris Healy <Chris.Healy@....aero>
Signed-off-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/dsa/mv88e6xxx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -712,7 +712,7 @@ static uint64_t _mv88e6xxx_get_ethtool_s
 		if (s->sizeof_stat == 8)
 			_mv88e6xxx_stats_read(ds, s->reg + 1, &high);
 	}
-	value = (((u64)high) << 16) | low;
+	value = (((u64)high) << 32) | low;
 	return value;
 }