netdev - Re: [PATCH RFC V2 2/6] net: bcmgenet: Avoid touching non-existent interrupt

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Date:   Sat, 2 Nov 2019 12:34:52 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Stefan Wahren <wahrenst@....net>,
        Matthias Brugger <matthias.bgg@...nel.org>,
        Matthias Brugger <mbrugger@...e.com>,
        "David S . Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     Eric Anholt <eric@...olt.net>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Doug Berger <opendmb@...il.com>, netdev@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RFC V2 2/6] net: bcmgenet: Avoid touching non-existent
 interrupt

On 11/2/2019 6:41 AM, Stefan Wahren wrote:
> As platform_get_irq() now prints an error when the interrupt does not
> exist, we are getting a confusing error message in case the optional
> WOL IRQ is not defined:
> 
>   bcmgenet fd58000.ethernet: IRQ index 2 not found
> 
> Fix this by using the platform_irq_count() helper to avoid touching a
> non-existent interrupt.
> 
> Fixes: 7723f4c5ecdb8d83 ("driver core: platform: Add an error message to platform_get_irq*()")
> Signed-off-by: Stefan Wahren <wahrenst@....net>
> ---
>  drivers/net/ethernet/broadcom/genet/bcmgenet.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> index 105b3be..ac554a6 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> @@ -3473,7 +3473,8 @@ static int bcmgenet_probe(struct platform_device *pdev)
>  		err = priv->irq1;
>  		goto err;
>  	}
> -	priv->wol_irq = platform_get_irq(pdev, 2);
> +	if (platform_irq_count(pdev) > 2)
> +		priv->wol_irq = platform_get_irq(pdev, 2);

Or you could use platform_get_irq_optional() for the WoL IRQ line?
-- 
Florian