linux-kernel - Re: [PATCH] brcmsmac: initialize morepending in brcms_b

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Message-ID: <CAMuHMdXJtmXJ65mKi4uFZb4GQuU0SBMTYmr+Rt6_QJcZnR1sUQ@mail.gmail.com>
Date:	Mon, 24 Dec 2012 13:02:18 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arend van Spriel <arend@...adcom.com>
Cc:	Piotr Haber <phaber@...adcom.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, brcm80211-dev-list@...adcom.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] brcmsmac: initialize morepending in brcms_b_recv()

On Sun, Dec 23, 2012 at 6:31 PM, Arend van Spriel <arend@...adcom.com> wrote:
> On 12/22/2012 10:07 PM, Geert Uytterhoeven wrote:
>> drivers/net/wireless/brcm80211/brcmsmac/main.c: In function ‘brcms_b_recv’:
>> drivers/net/wireless/brcm80211/brcmsmac/main.c:7636: warning: ‘morepending’ may be used uninitialized in this function
>
> Reading the code this warning seems to be invalid except when RXBND is
> defined as zero, which would make the whole function totally bogus.
> Would be good to have a WARN_ON(!RXBND) in brcms_b_attach().

I thought about the bound = false case immediately ending the loop.
But on closer look, it seems I missed that n and bound_limit are uint, not int.
So it's indeed unlikely to happen.

> I don't like pleasing a compiler with unnecessary initializers but I am
> also for builds with zero warnings. So...
>
> Acked-by: Arend van Spriel <arend@...adcom.com>
>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>> ---
>>  drivers/net/wireless/brcm80211/brcmsmac/main.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/net/wireless/brcm80211/brcmsmac/main.c b/drivers/net/wireless/brcm80211/brcmsmac/main.c
>> index 17594de..5f0f444 100644
>> --- a/drivers/net/wireless/brcm80211/brcmsmac/main.c
>> +++ b/drivers/net/wireless/brcm80211/brcmsmac/main.c
>> @@ -7633,7 +7633,7 @@ brcms_b_recv(struct brcms_hardware *wlc_hw, uint fifo, bool bound)
>>
>>       uint n = 0;
>>       uint bound_limit = bound ? RXBND : -1;
>> -     bool morepending;
>> +     bool morepending = false;
>>
>>       skb_queue_head_init(&recv_frames);

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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