linux-kernel - Re: [PATCH 1/4] drivers/misc/sgi-gru: remove unused variable

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Date:	Thu, 3 Sep 2015 08:09:56 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] drivers/misc/sgi-gru: remove unused variable

On Thu, Sep 03, 2015 at 10:10:12AM +0530, Sudip Mukherjee wrote:
> On Wed, Sep 02, 2015 at 09:42:04AM -0500, Dimitri Sivanich wrote:
> > On Wed, Sep 02, 2015 at 04:54:55PM +0530, Sudip Mukherjee wrote:
> > > These variables were only assigned some value and were never used.
> > > 
> > > Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> > > ---
> > > 
> <snip>
> > > +	int i;
> > +
> > + 	if ((GRU_NUM_TFM * GRU_CACHE_LINE_BYTES) > (ubufend - ubuf))
> > +		return -EFBIG;
> Just a minor (or major) doubt.
> The function returns GRU_NUM_TFM * GRU_CACHE_LINE_BYTES and the for loop
> is also running till GRU_NUM_TFM so I am assuming that the function can
> handle buffer till size of GRU_NUM_TFM * GRU_CACHE_LINE_BYTES. So the
> error -EFBIG should occur when the buffer is more than this. Then
> shouldn't it be:
> if ((GRU_NUM_TFM * GRU_CACHE_LINE_BYTES) < (ubufend - ubuf))
> 	return -EFBIG;
> 
> or i am wrong in interpreting it?
>
The likely intent was to return an error when the buffer isn't big enough
to hold GRU_NUM_TFM * GRU_CACHE_LINE_BYTES.
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