netdev - Re: [PATCH] net: usb: Correct reset handling of smsc95xx

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Date:   Fri, 14 Jan 2022 10:46:38 +0100
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Steve Glendinning <steve.glendinning@...well.net>,
        UNGLinuxDriver@...rochip.com,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Martyn Welch <martyn.welch@...labora.com>,
        Markus Reichl <m.reichl@...etechno.de>
Cc:     Markus Reichl <m.reichl@...etechno.de>,
        Gabriel Hojda <ghojda@...urs.ro>, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: usb: Correct reset handling of smsc95xx

Hi Markus,

Am Donnerstag, 13. Januar 2022, 21:01:11 CET schrieb Markus Reichl:
> On boards with LAN9514 and no preconfigured MAC address we don't get an
> ip address from DHCP after commit a049a30fc27c ("net: usb: Correct PHY
> handling of smsc95xx") anymore. Adding an explicit reset before starting
> the phy fixes the issue.
> 
> [1]
> https://lore.kernel.org/netdev/199eebbd6b97f52b9119c9fa4fd8504f8a34de18.came
> l@...labora.com/
> 
> From: Gabriel Hojda <ghojda@...urs.ro>
> Fixes: a049a30fc27c ("net: usb: Correct PHY handling of smsc95xx")
> Signed-off-by: Gabriel Hojda <ghojda@...urs.ro>
> Signed-off-by: Markus Reichl <m.reichl@...etechno.de>
> ---
>  drivers/net/usb/smsc95xx.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
> index abe0149ed917..bc1e3dd67c04 100644
> --- a/drivers/net/usb/smsc95xx.c
> +++ b/drivers/net/usb/smsc95xx.c
> @@ -1962,7 +1962,8 @@ static const struct driver_info smsc95xx_info = {
>  	.bind		= smsc95xx_bind,
>  	.unbind		= smsc95xx_unbind,
>  	.link_reset	= smsc95xx_link_reset,
> -	.reset		= smsc95xx_start_phy,
> +	.reset		= smsc95xx_reset,
> +	.check_connect	= smsc95xx_start_phy,
>  	.stop		= smsc95xx_stop,
>  	.rx_fixup	= smsc95xx_rx_fixup,
>  	.tx_fixup	= smsc95xx_tx_fixup,

Tested-by: Alexander Stein <alexander.stein@...tq-group.com>

This should go into stable-5.15!

Tested on a TQMa6x on MBa6 which uses a SMSC9500 as a second ethernet 
interface.
For the record: I noticed the problem as ARP replies were sent from the wrong 
interface. Thus my PC got the wrong MAC address which failed ping in the end.

Best regards,
Alexander