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

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Date:	Sun, 28 Mar 2010 22:28:13 +0300
From:	Olimpiu Pascariu <olimpiu.pascariu@...il.com>
To:	apw@...onical.com, akpm@...ux-foundation.org, dwalker@...o99.com,
	joe@...ches.com
Cc:	linux-kernel@...r.kernel.org
Subject: Checkpatch.pl false positive? "ERROR: return is not a function,
 parentheses are not required"

Hi,

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. 

Regards,
Olimpiu Pascariu




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