[PATCH net-next] net: stmmac: failure to probe without MAC interface specified

[Alexander Stein]

Am Dienstag, 29. August 2023, 15:29:50 CEST schrieb Russell King (Oracle):
> Alexander Stein reports that commit a014c35556b9 ("net: stmmac: clarify
> difference between "interface" and "phy_interface"") caused breakage,
> because plat->mac_interface will never be negative. Fix this by using
> the "rc" temporary variable in stmmac_probe_config_dt().
> 
> Reported-by: Alexander Stein <alexander.stein at ew.tq-group.com>
> Signed-off-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>
> ---
> I don't think the net tree is up to date with the net-next, so this
> patch needs applying to net-next preferably before the pull request
> to fix a regression.

On top of next-20230829:
Tested-by: Alexander Stein <alexander.stein at ew.tq-group.com>

Thanks

> Thanks.
> 
>  drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c index
> 35f4b1484029..0f28795e581c 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -419,9 +419,8 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8
> *mac) return ERR_PTR(phy_mode);
> 
>  	plat->phy_interface = phy_mode;
> -	plat->mac_interface = stmmac_of_get_mac_mode(np);
> -	if (plat->mac_interface < 0)
> -		plat->mac_interface = plat->phy_interface;
> +	rc = stmmac_of_get_mac_mode(np);
> +	plat->mac_interface = rc < 0 ? plat->phy_interface : rc;
> 
>  	/* Some wrapper drivers still rely on phy_node. Let's save it while
>  	 * they are not converted to phylink. */


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