linux-kernel - Re: [PATCH] dsa: mv88e6xxx: Fix error handling in mv88e6xxx_set_port

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Message-ID: <55306A57.4060701@roeck-us.net>
Date:	Thu, 16 Apr 2015 19:05:11 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dsa: mv88e6xxx: Fix error handling in mv88e6xxx_set_port_state

On 04/16/2015 11:51 AM, Geert Uytterhoeven wrote:
> On Thu, Apr 16, 2015 at 3:46 PM, Guenter Roeck <linux@...ck-us.net> wrote:
>> On 04/15/2015 10:12 PM, Guenter Roeck wrote:
>>>
>>> Return correct error code if _mv88e6xxx_reg_read returns an error.
>>>
>>> Fixes: facd95b2e0ec0 ("net: dsa: mv88e6xxx: Add Hardware bridging
>>> support")
>>> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
>>
>>
>> I should have given proper credit.
>>
>> Reported-by: kbuild test robot <fengguang.wu@...el.com>
>>
>> For the curious, neither W=1, W=2, C-1, C=2, nor sparse report this problem,
>> at least not with gcc 4.9.1.
>
> Good old gcc 4.1.2 (which I still use for m68k builds, and won't retire anytime
> soon as it finds real bugs in every new kernel release) says:
>
>      drivers/net/dsa/mv88e6xxx.c: In function ‘mv88e6xxx_set_port_state’:
>      drivers/net/dsa/mv88e6xxx.c:905: warning: ‘ret’ may be used
> uninitialized in this function
>
> Even after your patch, as it missed one case (patch sent).
>

Grumble. So much for trusting tools :-(

Thanks for fixing this!

Guenter

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