linux-kernel - [PATCH net-next] net: enetc: use get/put_unaligned() for mac address handling

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Message-Id: <20210604123018.24940-1-michael@walle.cc>
Date:   Fri,  4 Jun 2021 14:30:18 +0200
From:   Michael Walle <michael@...le.cc>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Claudiu Manoil <claudiu.manoil@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH net-next] net: enetc: use get/put_unaligned() for mac address handling

The supplied buffer for the MAC address might not be aligned. Thus
doing a 32bit (or 16bit) access could be on an unaligned address. For
now, enetc is only used on aarch64 which can do unaligned accesses, thus
there is no error. In any case, be correct and use the get/put_unaligned()
helpers.

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/net/ethernet/freescale/enetc/enetc_pf.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.c b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
index 31274325159a..a96d2acb5e11 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
 /* Copyright 2017-2019 NXP */
 
+#include <asm/unaligned.h>
 #include <linux/mdio.h>
 #include <linux/module.h>
 #include <linux/fsl/enetc_mdio.h>
@@ -17,15 +18,15 @@ static void enetc_pf_get_primary_mac_addr(struct enetc_hw *hw, int si, u8 *addr)
 	u32 upper = __raw_readl(hw->port + ENETC_PSIPMAR0(si));
 	u16 lower = __raw_readw(hw->port + ENETC_PSIPMAR1(si));
 
-	*(u32 *)addr = upper;
-	*(u16 *)(addr + 4) = lower;
+	put_unaligned(upper, (u32 *)addr);
+	put_unaligned(lower, (u16 *)(addr + 4));
 }
 
 static void enetc_pf_set_primary_mac_addr(struct enetc_hw *hw, int si,
 					  const u8 *addr)
 {
-	u32 upper = *(const u32 *)addr;
-	u16 lower = *(const u16 *)(addr + 4);
+	u32 upper = get_unaligned((const u32 *)addr);
+	u16 lower = get_unaligned((const u16 *)(addr + 4));
 
 	__raw_writel(upper, hw->port + ENETC_PSIPMAR0(si));
 	__raw_writew(lower, hw->port + ENETC_PSIPMAR1(si));
-- 
2.20.1