linux-kernel - Re: [PATCH -next] net: stmmac: Fix an error code in dwmac-ingenic.c

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Date:   Thu, 24 Jun 2021 16:25:49 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Yang Li <yang.lee@...ux.alibaba.com>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, kuba@...nel.org,
        mcoquelin.stm32@...il.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 -next] net: stmmac: Fix an error code in dwmac-ingenic.c

On Wed, Jun 16, 2021 at 10:39:08AM +0800, Yang Li wrote:
> When IS_ERR(mac->regmap) returns true, the value of ret is 0.
> So, we set ret to -ENODEV to indicate this error.
> 
> Clean up smatch warning:
> drivers/net/ethernet/stmicro/stmmac/dwmac-ingenic.c:266
> ingenic_mac_probe() warn: missing error code 'ret'
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-ingenic.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-ingenic.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-ingenic.c
> index 60984c1..f3950e0 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ingenic.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ingenic.c
> @@ -263,6 +263,7 @@ static int ingenic_mac_probe(struct platform_device *pdev)
>  	mac->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "mode-reg");
>  	if (IS_ERR(mac->regmap)) {
>  		dev_err(&pdev->dev, "%s: Failed to get syscon regmap\n", __func__);
> +		ret = -ENODEV;

mac->regmap is a ERR_PTR(), containing an error code. Please use that
error code, not ENODEV.

      Andrew