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aFrom aa3d020b22cb844ab7bdbb9e5d861a64666e2b74 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 9 Jun 2021 12:52:12 +0300
Subject: [PATCH] net: dsa: qca8k: fix an endian bug in
qca8k_get_ethtool_stats()
The "hi" variable is a u64 but the qca8k_read() writes to the top 32
bits of it. That will work on little endian systems but it's a bit
subtle. It's cleaner to make declare "hi" as a u32. We will still need
to cast it when we shift it later on in the function but that's fine.
Fixes: 7c9896e37807 ("net: dsa: qca8k: check return value of read functions correctly")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/dsa/qca8k.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -1412,7 +1412,7 @@ qca8k_get_ethtool_stats(struct dsa_switc
struct qca8k_priv *priv = (struct qca8k_priv *)ds->priv;
const struct qca8k_mib_desc *mib;
u32 reg, i, val;
- u64 hi = 0;
+ u32 hi = 0;
int ret;
for (i = 0; i < ARRAY_SIZE(ar8327_mib); i++) {
@@ -1424,14 +1424,14 @@ qca8k_get_ethtool_stats(struct dsa_switc
continue;
if (mib->size == 2) {
- ret = qca8k_read(priv, reg + 4, (u32 *)&hi);
+ ret = qca8k_read(priv, reg + 4, &hi);
if (ret < 0)
continue;
}
data[i] = val;
if (mib->size == 2)
- data[i] |= hi << 32;
+ data[i] |= (u64)hi << 32;
}
}
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