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

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Message-ID: <CAMuHMdVEbXGLR_svG9tHVMSvEOfajNX6GxAo113n2TfvGSRcwA@mail.gmail.com>
Date:	Thu, 16 Apr 2015 20:51:08 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Guenter Roeck <linux@...ck-us.net>
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 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).

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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