netdev - Re: [PATCH net-next RESEND] net: fec: Do proper error checking for enet

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Message-ID: <Yof3/o46wXWXMsKo@lunn.ch>
Date:   Fri, 20 May 2022 22:20:14 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Joakim Zhang <qiangqing.zhang@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        NXP Linux Team <linux-imx@....com>, kernel@...gutronix.de
Subject: Re: [PATCH net-next RESEND] net: fec: Do proper error checking for
 enet_out clk

> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index 11227f51404c..2512b68d8545 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -3866,9 +3866,11 @@ fec_probe(struct platform_device *pdev)
>  	fep->itr_clk_rate = clk_get_rate(fep->clk_ahb);
>  
>  	/* enet_out is optional, depends on board */
> -	fep->clk_enet_out = devm_clk_get(&pdev->dev, "enet_out");
> -	if (IS_ERR(fep->clk_enet_out))
> -		fep->clk_enet_out = NULL;
> +	fep->clk_enet_out = devm_clk_get_optional(&pdev->dev, "enet_out");
> +	if (IS_ERR(fep->clk_enet_out)) {
> +		ret = PTR_ERR(fep->clk_enet_out);
> +		goto failed_clk;
> +	}
>  
>  	fep->ptp_clk_on = false;
>  	mutex_init(&fep->ptp_clk_mutex);

Reviewed-by: Andrew Lunn <andrew@...n.ch>

This is O.K, as far as it goes. But directly after this we have:

	/* clk_ref is optional, depends on board */
	fep->clk_ref = devm_clk_get(&pdev->dev, "enet_clk_ref");
	if (IS_ERR(fep->clk_ref))
		fep->clk_ref = NULL;
	fep->clk_ref_rate = clk_get_rate(fep->clk_ref);

It would be good to do the same to this clock as well.

    Andrew