netdev - Re: [PATCH net-next] net: dsa: felix: suppress -EPROBE

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Date:   Thu, 7 Apr 2022 13:56:13 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Michael Walle <michael@...le.cc>
CC:     Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dsa: felix: suppress -EPROBE_DEFER errors

On Thu, Apr 07, 2022 at 03:06:25PM +0200, Michael Walle wrote:
> Due to missing prerequisites the probe of the felix switch might be
> deferred:
> [    4.435305] mscc_felix 0000:00:00.5: Failed to register DSA switch: -517
> 
> It's not an error. Use dev_err_probe() to demote the error to a debug
> message. While at it, replace all the dev_err()'s in the probe with
> dev_err_probe().
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---

Please limit the dev_err_probe() to dsa_register_switch(). The resource
that is missing is the DSA master, see of_find_net_device_by_node().
The others cannot possibly return -EPROBE_DEFER.

> 
> Should this be a patch with a Fixes tag?

Whichever way you wish, no preference.

> 
>  drivers/net/dsa/ocelot/felix_vsc9959.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
> index 8d382b27e625..1f8c4c6de01b 100644
> --- a/drivers/net/dsa/ocelot/felix_vsc9959.c
> +++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
> @@ -2268,14 +2268,14 @@ static int felix_pci_probe(struct pci_dev *pdev,
>  
>  	err = pci_enable_device(pdev);
>  	if (err) {
> -		dev_err(&pdev->dev, "device enable failed\n");
> +		dev_err_probe(&pdev->dev, err, "device enable failed\n");
>  		goto err_pci_enable;
>  	}
>  
>  	felix = kzalloc(sizeof(struct felix), GFP_KERNEL);
>  	if (!felix) {
>  		err = -ENOMEM;
> -		dev_err(&pdev->dev, "Failed to allocate driver memory\n");
> +		dev_err_probe(&pdev->dev, err, "Failed to allocate driver memory\n");
>  		goto err_alloc_felix;
>  	}
>  
> @@ -2293,7 +2293,7 @@ static int felix_pci_probe(struct pci_dev *pdev,
>  					&felix_irq_handler, IRQF_ONESHOT,
>  					"felix-intb", ocelot);
>  	if (err) {
> -		dev_err(&pdev->dev, "Failed to request irq\n");
> +		dev_err_probe(&pdev->dev, err, "Failed to request irq\n");
>  		goto err_alloc_irq;
>  	}
>  
> @@ -2316,7 +2316,7 @@ static int felix_pci_probe(struct pci_dev *pdev,
>  
>  	err = dsa_register_switch(ds);
>  	if (err) {
> -		dev_err(&pdev->dev, "Failed to register DSA switch: %d\n", err);
> +		dev_err_probe(&pdev->dev, err, "Failed to register DSA switch\n");
>  		goto err_register_ds;
>  	}
>  
> -- 
> 2.30.2
>