linux-kernel - Re: [patch 6/6] otus: zfRateCtrlRateDiff(): remove duplicate comparison

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Date:	Sat, 9 Jan 2010 11:44:38 +0300
From:	Dan Carpenter <error27@...il.com>
To:	horms@...genet.net
Cc:	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Peter Huewe <PeterHuewe@....de>
Subject: Re: [patch 6/6] otus: zfRateCtrlRateDiff(): remove duplicate
	comparison

On Fri, Jan 08, 2010 at 06:57:54PM +1100, horms@...genet.net wrote:
> I think this is correct.
> 
> $ gcc (Debian 4.4.2-8) 4.4.2
> Copyright (C) 2009 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> 
> $ make
> ...
> drivers/staging/otus/80211core/ratectrl.c: In function
> 'zfRateCtrlRateDiff':
> drivers/staging/otus/80211core/ratectrl.c:433: warning: suggest parentheses
> around comparison in operand of '=='
> ...
> 
> Signed-off-by: Simon Horman <horms@...ge.net.au>
> 
> Index: linux-2.6/drivers/staging/otus/80211core/ratectrl.c
> ===================================================================
> --- linux-2.6.orig/drivers/staging/otus/80211core/ratectrl.c	2010-01-08 17:13:44.000000000 +1100
> +++ linux-2.6/drivers/staging/otus/80211core/ratectrl.c	2010-01-08 17:14:02.000000000 +1100
> @@ -430,7 +430,7 @@ u8_t zfRateCtrlRateDiff(struct zsRcCell*
>              {
>                  return ((rcCell->currentRateIndex - i)+1)>>1;
>              }
> -            else if (i == rcCell->currentRateIndex == 0)
> +            else if (i == rcCell->currentRateIndex)

You realize you have reversed the meaning of the test?  The original 
was the same as if (i != rcCell->currentRateIndex).

Your patch is possibly correct, but it's hard to know.  I would
leave this for now until someone grovels through the code to find
out for sure if it should be == or !=.  If we silence the warning,
no one will ever look at this code again.

regards,
dan carpenter

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