linux-kernel - Re: [PATCH] net: ravb_main: fix a missing check of of_get_phy

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Date:   Tue, 12 Mar 2019 10:38:21 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, "David S. Miller" <davem@...emloft.net>,
        Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Andrew Lunn <andrew@...n.ch>,
        Magnus Damm <damm+renesas@...nsource.se>,
        Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ravb_main: fix a missing check of of_get_phy_mode

On 12.03.2019 9:38, Kangjie Lu wrote:

> of_get_phy_mode may fail and return a negative error code;
> the fix checks the return value of of_get_phy_mode and
> goes to out_release if it fails.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>   drivers/net/ethernet/renesas/ravb_main.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index d28c8f9ca55b..791b6842eb12 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -1996,6 +1996,7 @@ static int ravb_probe(struct platform_device *pdev)
>   	int error, irq, q;
>   	struct resource *res;
>   	int i;
> +	int ret;

    There's the 'error' variable already for such things, use it.

>   
>   	if (!np) {
>   		dev_err(&pdev->dev,
> @@ -2054,7 +2055,12 @@ static int ravb_probe(struct platform_device *pdev)
>   	spin_lock_init(&priv->lock);
>   	INIT_WORK(&priv->work, ravb_tx_timeout_work);
>   
> -	priv->phy_interface = of_get_phy_mode(np);
> +	ret = of_get_phy_mode(np);
> +	if (ret < 0) {
> +		error = -EINVAL;

    We typically propagate the errors upstream...

[...]

MBR, Sergei