linux-kernel - Re: Checkpatch.pl false positive? "ERROR: return is not a function, parentheses are not required"

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Message-ID: <20100328200922.GB27351@core2>
Date:	Sun, 28 Mar 2010 23:09:22 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Olimpiu Pascariu <olimpiu.pascariu@...il.com>
Cc:	apw@...onical.com, akpm@...ux-foundation.org, dwalker@...o99.com,
	joe@...ches.com, linux-kernel@...r.kernel.org
Subject: Re: Checkpatch.pl false positive? "ERROR: return is not a
 function, parentheses are not required"

On Sun, Mar 28, 2010 at 10:28:13PM +0300, Olimpiu Pascariu wrote:
> I've used checkpatch.pl to verify drivers/staging/dt3155/dt3155_isr.c,
> in order to provide a patch which fixes the errors and warnings found by
> checkpatch.
> The script returns the following error:
> ERROR: return is not a function, parentheses are not required
> #155: FILE: staging/dt3155/dt3155_isr.c:155:
> +  return (dt3155_fbuffer[m]->ready_head -
> 
> The original code is:
> 
>   return (dt3155_fbuffer[m]->ready_head -
>            dt3155_fbuffer[m]->ready_len +
>            dt3155_fbuffer[m]->nbuffers)%
>           (dt3155_fbuffer[m]->nbuffers);
> 
> I've deleted the the first open parenthesis and the last close
> parenthesis, and now the code looks like this:
> 
>   return (dt3155_fbuffer[m]->ready_head -
>            dt3155_fbuffer[m]->ready_len +
>            dt3155_fbuffer[m]->nbuffers)%
>           (dt3155_fbuffer[m]->nbuffers);
> 
> IMHO the code is correct, though an auxiliary variable could be used to
> avoid this error returned by checkpatch.pl. 

Yes, checkpatch.pl doesn't understand C.
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