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

From: Tristram.Ha
Date: Thu Aug 01 2024 - 20:05:45 EST


From: Tristram Ha <tristram.ha@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
---
drivers/net/dsa/microchip/ksz_common.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index b074b4bb0629..2725c5bc311c 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -3764,6 +3764,12 @@ 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.supported = 0;
+ wol.wolopts = 0;
+
ksz_get_wol(ds, dp->index, &wol);
if (wol.wolopts & WAKE_MAGIC) {
dev_err(ds->dev,
--
2.34.1