linux-kernel - Re: [PATCH net] net: stmmac: dwmac-qcom-ethqos: fix a regression on EMAC

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Message-ID: <ceg2ztzk3lzowssoydxwdq5pe3w7bgfbdpgalds3gwn5r2l5xb@bqufsqrqwlid>
Date:   Fri, 2 Jun 2023 14:30:37 -0500
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH net] net: stmmac: dwmac-qcom-ethqos: fix a regression on
 EMAC < 3

On Fri, Jun 02, 2023 at 09:04:55PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> We must not assign plat_dat->dwmac4_addrs unconditionally as for
> structures which don't set them, this will result in the core driver
> using zeroes everywhere and breaking the driver for older HW. On EMAC < 2
> the address should remain NULL.
> 
> Fixes: b68376191c69 ("net: stmmac: dwmac-qcom-ethqos: Add EMAC3 support")
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Reviewed-by: Andrew Halaney <ahalaney@...hat.com>

Thanks for the fix, sorry about that!

> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index 16a8c361283b..f07905f00f98 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -644,7 +644,8 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
>  	plat_dat->fix_mac_speed = ethqos_fix_mac_speed;
>  	plat_dat->dump_debug_regs = rgmii_dump;
>  	plat_dat->has_gmac4 = 1;
> -	plat_dat->dwmac4_addrs = &data->dwmac4_addrs;
> +	if (ethqos->has_emac3)
> +		plat_dat->dwmac4_addrs = &data->dwmac4_addrs;
>  	plat_dat->pmt = 1;
>  	plat_dat->tso_en = of_property_read_bool(np, "snps,tso");
>  	if (of_device_is_compatible(np, "qcom,qcs404-ethqos"))
> -- 
> 2.39.2
>