netdev - Re: [PATCH 08/10] net: fjes: Handle return value of platform_get_irq and platform_get

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Date:   Sat, 2 Dec 2017 23:06:09 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>, wg@...ndegger.com,
        mkl@...gutronix.de, michal.simek@...inx.com, opendmb@...il.com,
        f.fainelli@...il.com, davem@...emloft.net,
        Vladislav.Zakharov@...opsys.com
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 08/10] net: fjes: Handle return value of platform_get_irq
 and platform_get_resource

Hello!

On 12/02/2017 10:26 PM, Arvind Yadav wrote:

> platform_get_irq() and platform_get_resource() can fail here and
> we must check its return value.
> 
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> ---
>   drivers/net/fjes/fjes_main.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/net/fjes/fjes_main.c b/drivers/net/fjes/fjes_main.c
> index 750954b..540dd51 100644
> --- a/drivers/net/fjes/fjes_main.c
> +++ b/drivers/net/fjes/fjes_main.c
> @@ -1265,9 +1265,19 @@ static int fjes_probe(struct platform_device *plat_dev)
>   	adapter->interrupt_watch_enable = false;
>   
>   	res = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		err = -EINVAL;
> +		goto err_free_netdev;
> +	}
> +
>   	hw->hw_res.start = res->start;
>   	hw->hw_res.size = resource_size(res);
>   	hw->hw_res.irq = platform_get_irq(plat_dev, 0);
> +	if (hw->hw_res.irq <= 0) {

    This function no longer returns 0 on error, no need to check for <= 0.

> +		err = hw->hw_res.irq ? hw->hw_res.irq : -ENODEV;
> +		goto err_free_netdev;

    gcc allows a shorter way to write that.

		err = hw->hw_res.irq ?: -ENODEV;

> +	}
> +
>   	err = fjes_hw_init(&adapter->hw);
>   	if (err)
>   		goto err_free_netdev;

MBR, Sergei