linux-kernel - Re: [PATCH v4] mfd: syscon: Add non-DT support

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Date:	Fri, 22 Feb 2013 08:27:19 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Dong Aisheng <b29396@...escale.com>
Cc:	Alexander Shiyan <shc_work@...l.ru>, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH v4] mfd: syscon: Add non-DT support

On Fri, Feb 22, 2013 at 03:13:12PM +0800, Dong Aisheng wrote:
> On Fri, Feb 22, 2013 at 11:01:18AM +0400, Alexander Shiyan wrote:
> > > On Thu, Feb 21, 2013 at 07:29:02PM +0400, Alexander Shiyan wrote:
> > > > This patch allow using syscon driver from the platform data, i.e.
> > > > possibility using driver on systems without oftree support.
> > > > For search syscon device from the client drivers,
> > > > "syscon_regmap_lookup_by_pdevname" function was added.
> > > > 
> > > > Signed-off-by: Alexander Shiyan <shc_work@...l.ru>
> > > 
> > > [...]
> > > 
> > > > +	syscon->base = devm_ioremap_resource(dev, res);
> > > > +	if (!syscon->base)
> > > 
> > > Is this correct?
> > 
> > Hmm, of course IS_ERR should be used here...
> > v5?
> > 
> 
> Yes.
> >From here:
> https://lkml.org/lkml/2013/1/21/140
> It seems it is.
> 
> > > 
> > > > +		return -EBUSY;
> 
> Both this line could also be changed.
> 
> > > >
> > > 
> > > Otherwise, i'm also ok with this patch.
> > > Acked-by: Dong Aisheng <dong.aisheng@...aro.org>
> > > 
> > > BTW, i did not see Samuel's tree having this new API.
> > > So, who will pick this patch?
> > 
> > I have same question.
> 
> I CCed Thierry and Greg who may know it.

Yes, devm_ioremap_resource() never returns NULL. You always need to
check the returned pointer with IS_ERR(). The value that you return
should be extracted from the pointer with PTR_ERR().

Thierry

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