netdev - Re: [PATCH] net: broadcom: bcm4908enet: add platform_get_irq

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Message-ID: <Yx8YDUaxXBEFYyON@kadam>
Date:   Mon, 12 Sep 2022 14:29:17 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Yu Zhe <yuzhe@...china.com>
Cc:     rafal@...ecki.pl, bcm-kernel-feedback-list@...adcom.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        liqiong@...china.com
Subject: Re: [PATCH] net: broadcom: bcm4908enet: add platform_get_irq_byname
 error checking

On Fri, Sep 09, 2022 at 02:25:45PM +0800, Yu Zhe wrote:
> The platform_get_irq_byname() function returns negative error codes on error,
> check it.
> 
> Signed-off-by: Yu Zhe <yuzhe@...china.com>
> ---
>  drivers/net/ethernet/broadcom/bcm4908_enet.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/broadcom/bcm4908_enet.c b/drivers/net/ethernet/broadcom/bcm4908_enet.c
> index c131d8118489..d985056db6c2 100644
> --- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
> +++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
> @@ -705,6 +705,8 @@ static int bcm4908_enet_probe(struct platform_device *pdev)
>  		return netdev->irq;
>  
>  	enet->irq_tx = platform_get_irq_byname(pdev, "tx");
> +	if (enet->irq_tx < 0)
> +		return enet->irq_tx;
>  

If you read the driver, then you will see that this is deliberate.
Search for irq_tx and read the comments.  I'm not a subsystem expert so
I don't know if this an ideal way to write the code, but it's done
deliberately so please don't change it unless you can test it.

regards,
dan carpenter