Re: [PATCH net] net: dsa: microchip: Fix Wake-on-LAN check to not return an error
From: Oleksij Rempel
Date: Fri Aug 02 2024 - 00:45:59 EST
On Thu, Aug 01, 2024 at 05:05:10PM -0700, Tristram.Ha@xxxxxxxxxxxxx wrote:
> 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,
Only wol.wolopts need to be cleared. wol.supported can be dropped.
With this change:
Reviewed-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
Regards,
Oleksij
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