netdev - [PATCH net v2] net: dsa: microchip: Fix Wake-on-LAN check to not return an error

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Message-ID: <20240805235200.24982-1-Tristram.Ha@microchip.com>
Date: Mon, 5 Aug 2024 16:52:00 -0700
From: <Tristram.Ha@...rochip.com>
To: Woojung Huh <woojung.huh@...rochip.com>, Andrew Lunn <andrew@...n.ch>,
	Vivien Didelot <vivien.didelot@...il.com>, Florian Fainelli
	<f.fainelli@...il.com>, Vladimir Oltean <olteanv@...il.com>
CC: Oleksij Rempel <o.rempel@...gutronix.de>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	<UNGLinuxDriver@...rochip.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Tristram Ha <tristram.ha@...rochip.com>
Subject: [PATCH net v2] net: dsa: microchip: Fix Wake-on-LAN check to not return an error

From: Tristram Ha <tristram.ha@...rochip.com>

The wol variable in ksz_port_set_mac_address() is declared with random
data, but the code in ksz_get_wol call may not be executed so the
WAKE_MAGIC check may be invalid resulting in an error message when
setting a MAC address after starting the DSA driver.

Fixes: 3b454b6390c3 ("net: dsa: microchip: ksz9477: Add Wake on Magic Packet support")
Signed-off-by: Tristram Ha <tristram.ha@...rochip.com>
Reviewed-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
v2
- Update with Oleksij's suggestion

 drivers/net/dsa/microchip/ksz_common.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index b074b4bb0629..b120e66d5669 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -3764,6 +3764,11 @@ static int ksz_port_set_mac_address(struct dsa_switch *ds, int port,
 		return -EBUSY;
 	}
 
+	/* Need to initialize variable as the code to fill in settings may
+	 * not be executed.
+	 */
+	wol.wolopts = 0;
+
 	ksz_get_wol(ds, dp->index, &wol);
 	if (wol.wolopts & WAKE_MAGIC) {
 		dev_err(ds->dev,
-- 
2.34.1