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Date: Thu, 3 Jan 2013 19:04:55 +0300
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Grant Likely <grant.likely@secretlab.ca>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
        Cyril Roelandt <tipecaml@gmail.com>,
        spi-devel-general@lists.sourceforge.net,
        kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/5] spi: fix return value check in hspi_probe().
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On Sat, Dec 22, 2012 at 09:56:20AM +0000, Grant Likely wrote:
> On Wed, 19 Dec 2012 19:39:14 +0300, Dan Carpenter <dan.carpenter@oracle.com> wrote:
> > On Wed, Dec 19, 2012 at 03:11:54PM +0000, Grant Likely wrote:
> > > On Tue, 11 Dec 2012 16:36:27 -0800 (PST), Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> wrote:
> > > > 
> > > > Hi
> > > > 
> > > > > According to its documentation, clk_get() returns a "valid IS_ERR() condition
> > > > > containing errno", so we should call IS_ERR() rather than a NULL check.
> > > > > 
> > > > > Signed-off-by: Cyril Roelandt <tipecaml@gmail.com>
> > > > 
> > > > Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
> > > 
> > > Applied, thanks.
> > 
> > In another thread, we were just talking about who clk_get() can
> > return a NULL if !CONFIG_HAVE_CLK.  That might change to match the
> > documentation later...  Not sure.
> 
> So what is the solution here? Will the dummy clk_get() be changed, or is
> there more work needed on the drivers?
> 

This driver can't function without a clk.  It should select that at
build time instead of testing for it at probe.  Just checking for
IS_ERR() will NOT cause a NULL dereference so the patch is ok in
that respect.  I'm not sure if this can be build without
CONFIG_HAVE_CLK.

regards,
dan carpenter