netdev - Re: [PATCH 05/10] net: ethernet: i825xx: Fix platform_get

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Message-ID: <2b23637d-0d19-4a6a-4e67-e64968f85415@cogentembedded.com>
Date:   Sat, 2 Dec 2017 23:08:47 +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 05/10] net: ethernet: i825xx: Fix platform_get_irq's error
 checking

Hello.

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

> The platform_get_irq() function returns negative if an error occurs.
> zero or positive number on success. platform_get_irq() error checking
> for zero is not correct.

    The why you consider returning 0 a sign of failure?

> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> ---
>   drivers/net/ethernet/i825xx/sni_82596.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/i825xx/sni_82596.c b/drivers/net/ethernet/i825xx/sni_82596.c
> index b2c04a7..a6d56f5 100644
> --- a/drivers/net/ethernet/i825xx/sni_82596.c
> +++ b/drivers/net/ethernet/i825xx/sni_82596.c
> @@ -120,9 +120,10 @@ static int sni_82596_probe(struct platform_device *dev)
>   	netdevice->dev_addr[5] = readb(eth_addr + 0x06);
>   	iounmap(eth_addr);
>   
> -	if (!netdevice->irq) {
> +	if (netdevice->irq <= 0) {
>   		printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
>   			__FILE__, netdevice->base_addr);
> +		retval = netdevice->irq ? netdevice->irq : -ENODEV;
>   		goto probe_failed;
>   	}
>   

MBR, Sergei