netdev - Re: [PATCH] net: macb: Fix mdio child node detection

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Date:   Wed, 27 Oct 2021 08:38:49 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <linux@...ck-us.net>, <Nicolas.Ferre@...rochip.com>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <sean.anderson@...o.com>,
        <andrew@...n.ch>
Subject: Re: [PATCH] net: macb: Fix mdio child node detection

On 26.10.2021 20:39, Guenter Roeck wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Commit 4d98bb0d7ec2 ("net: macb: Use mdio child node for MDIO bus if it
> exists") added code to detect if a 'mdio' child node exists to the macb
> driver. Ths added code does, however, not actually check if the child node
> exists, but if the parent node exists. This results in errors such as
> 
> macb 10090000.ethernet eth0: Could not attach PHY (-19)
> 
> if there is no 'mdio' child node. Fix the code to actually check for
> the child node.
> 
> Fixes: 4d98bb0d7ec2 ("net: macb: Use mdio child node for MDIO bus if it exists")
> Cc: Sean Anderson <sean.anderson@...o.com>
> Cc: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>> ---

Patch solves the failure also on sama5d2_xplained. You can add:

Tested-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

Thank you,
Claudiu Beznea

>  drivers/net/ethernet/cadence/macb_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index 309371abfe23..ffce528aa00e 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -901,7 +901,7 @@ static int macb_mdiobus_register(struct macb *bp)
>          * directly under the MAC node
>          */
>         child = of_get_child_by_name(np, "mdio");
> -       if (np) {
> +       if (child) {
>                 int ret = of_mdiobus_register(bp->mii_bus, child);
> 
>                 of_node_put(child);
> --
> 2.33.0
>