linux-kernel - Re: [PATCH] stmmac: dwmac-loongson:add the return value

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Message-ID: <20210830113020.3ea992a2@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 30 Aug 2021 11:30:20 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Qing Zhang <zhangqing@...ngson.cn>
Cc:     zhaoxiao <zhaoxiao@...ontech.com>, davem@...emloft.net,
        mcoquelin.stm32@...il.com, peppe.cavallaro@...com,
        alexandre.torgue@...s.st.com, joabreu@...opsys.com,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] stmmac: dwmac-loongson:add the return value

On Mon, 30 Aug 2021 13:29:13 +0800 zhaoxiao wrote:
> Add the return value when phy_mode < 0.
> 
> Signed-off-by: zhaoxiao <zhaoxiao@...ontech.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> index 4c9a37dd0d3f..ecf759ee1c9f 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> @@ -109,8 +109,10 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id
>  		plat->bus_id = pci_dev_id(pdev);
>  
>  	phy_mode = device_get_phy_mode(&pdev->dev);
> -	if (phy_mode < 0)
> +	if (phy_mode < 0) {
>  		dev_err(&pdev->dev, "phy_mode not found\n");
> +		return phy_mode;
> +	}
>  
>  	plat->phy_interface = phy_mode;
>  	plat->interface = PHY_INTERFACE_MODE_GMII;

Qing Zhang, does the change look correct to you?

Is it better to assume GMII and continue like the code is currently
doing?