linux-kernel - Re: [PATCH] stmmac: dwmac-loongson: change the pr_info() to dev_err() in loongson_dwmac

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Date:   Fri, 27 Aug 2021 07:02:38 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     zhaoxiao <zhaoxiao@...ontech.com>
Cc:     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: change the pr_info() to
 dev_err() in loongson_dwmac_probe()

On Fri, 27 Aug 2021 16:55:50 +0800 zhaoxiao wrote:
> - Change the pr_info/dev_info to dev_err.
> - Add the dev_err to improve readability.
> 
> Signed-off-by: zhaoxiao <zhaoxiao@...ontech.com>
> ---
>  .../net/ethernet/stmicro/stmmac/dwmac-loongson.c  | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> index 4c9a37dd0d3f..495c94e7929f 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> @@ -54,20 +54,21 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id
>  	bool mdio = false;
>  
>  	np = dev_of_node(&pdev->dev);
> -
>  	if (!np) {
> -		pr_info("dwmac_loongson_pci: No OF node\n");
> +		dev_err(&pdev->dev, "dwmac_loongson_pci: No OF node\n");
>  		return -ENODEV;
>  	}
>  
>  	if (!of_device_is_compatible(np, "loongson, pci-gmac")) {
> -		pr_info("dwmac_loongson_pci: Incompatible OF node\n");
> +		dev_err(&pdev->dev, "dwmac_loongson_pci: Incompatible OF node\n");
>  		return -ENODEV;
>  	}
>  
>  	plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
> -	if (!plat)
> +	if (!plat) {
> +		dev_err(&pdev->dev, "memory allocation failed\n");

Please don't add error messages after allocation failures. OOM will
produce a lot of kernel messages and a stack trace already.

>  		return -ENOMEM;
> +	}
>  
>  	if (plat->mdio_node) {
>  		dev_err(&pdev->dev, "Found MDIO subnode\n");
> @@ -109,8 +110,10 @@ 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;

You're adding a return here, it should be a separate patch with its own
justification.

> +	}
>  
>  	plat->phy_interface = phy_mode;
>  	plat->interface = PHY_INTERFACE_MODE_GMII;
> @@ -130,7 +133,7 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id
>  
>  	res.wol_irq = of_irq_get_byname(np, "eth_wake_irq");
>  	if (res.wol_irq < 0) {
> -		dev_info(&pdev->dev, "IRQ eth_wake_irq not found, using macirq\n");
> +		dev_err(&pdev->dev, "IRQ eth_wake_irq not found, using macirq\n");

Why upgrade to an error, isn't wol_irq optional?

>  		res.wol_irq = res.irq;
>  	}
>