From: Dan Carpenter <dan.carpenter@oracle.com>
To: Andrew Lunn <andrew@lunn.ch>, Yang Yingliang <yangyingliang@huawei.com>
Cc: Vivien Didelot <vivien.didelot@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Vladimir Oltean <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH 1/2 net-next] net: dsa: qca8k: fix an endian bug in qca8k_get_ethtool_stats()
Date: Wed, 9 Jun 2021 12:52:12 +0300 [thread overview]
Message-ID: <YMCPTLkZumD3Vv/X@mwanda> (raw)
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>
---
drivers/net/dsa/qca8k.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 6fe963ba23e8..9df3514d1ff2 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -1412,7 +1412,7 @@ qca8k_get_ethtool_stats(struct dsa_switch *ds, int port,
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_switch *ds, int port,
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;
}
}
--
2.30.2
next reply other threads:[~2021-06-09 9:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-09 9:52 Dan Carpenter [this message]
2021-06-09 9:53 ` [PATCH 2/2 net-next] net: dsa: qca8k: check the correct variable in qca8k_set_mac_eee() Dan Carpenter
2021-06-09 13:48 ` Vladimir Oltean
2021-06-09 13:44 ` [PATCH 1/2 net-next] net: dsa: qca8k: fix an endian bug in qca8k_get_ethtool_stats() Vladimir Oltean
2021-06-09 21:20 ` patchwork-bot+netdevbpf
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