linux-kernel - Re: [PATCH 1/1] net: bcmgenet: fix incorrect return value checks

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Date:   Mon, 24 Apr 2017 15:48:06 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     bianpan201602@....com
Cc:     f.fainelli@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bianpan2016@....com
Subject: Re: [PATCH 1/1] net: bcmgenet: fix incorrect return value checks

From: Pan Bian <bianpan201602@....com>
Date: Sun, 23 Apr 2017 18:01:05 +0800

> From: Pan Bian <bianpan2016@....com>
> 
> Function platform_get_irq() will return a negative value on errors.
> However, in function bcmgenet_probe(), 0 is considered as a flag of
> error. This patch fixes the bug by checking whether the return value of
> platform_get_irq() is less than 0.
> 
> Signed-off-by: Pan Bian <bianpan2016@....com>

I'm definitely not confident enough to apply this.

On some platform zero IRQs are invalid.

There are also lots of pieces of code that check the return value ">
0" as success.