linux-kernel - Re: [PATCH 5/6] regulator: ti-abb: simplify platform_get_resource_byname/devm_ioremap

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Message-ID: <alpine.DEB.2.02.1308191210300.2313@hadrien>
Date:	Mon, 19 Aug 2013 12:12:55 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	walter harms <wharms@....de>
cc:	Liam Girdwood <lgirdwood@...il.com>,
	kernel-janitors@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] regulator: ti-abb: simplify
 platform_get_resource_byname/devm_ioremap_resource

On Mon, 19 Aug 2013, walter harms wrote:

>
>
> Am 19.08.2013 10:51, schrieb Julia Lawall:
> > From: Julia Lawall <Julia.Lawall@...6.fr>
> >
> > Remove unneeded error handling on the result of a call to
> > platform_get_resource_byname when the value is passed to devm_ioremap_resource.
> >
> > A simplified version of the semantic patch that makes this change is as
> > follows: (http://coccinelle.lip6.fr/)
> >
> > // <smpl>
> > @@
> > expression pdev,res,e,e1;
> > expression ret != 0;
> > identifier l;
> > @@
> >
> >   res = platform_get_resource_byname(...);
> > - if (res == NULL) { ... \(goto l;\|return ret;\) }
> >   e = devm_ioremap_resource(e1, res);
> > // </smpl>
> >
> > Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> >
> > ---
> >  drivers/regulator/ti-abb-regulator.c |   10 ----------
> >  1 file changed, 10 deletions(-)
> >
> > diff --git a/drivers/regulator/ti-abb-regulator.c b/drivers/regulator/ti-abb-regulator.c
> > index 3753ed0..d8e3e12 100644
> > --- a/drivers/regulator/ti-abb-regulator.c
> > +++ b/drivers/regulator/ti-abb-regulator.c
> > @@ -717,11 +717,6 @@ static int ti_abb_probe(struct platform_device *pdev)
> >  	/* Map ABB resources */
> >  	pname = "base-address";
> >  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);
> > -	if (!res) {
> > -		dev_err(dev, "Missing '%s' IO resource\n", pname);
> > -		ret = -ENODEV;
> > -		goto err;
> > -	}
> >  	abb->base = devm_ioremap_resource(dev, res);
> >  	if (IS_ERR(abb->base)) {
> >  		ret = PTR_ERR(abb->base);
>
>
> is pname used by anything else ? (also below)

I'm not sure to understand the sense of the question.  My patch does
remove a use of pname, but there is another one on the line above, in the
call to platform_get_resource_byname.  Perhaps the definition of pname
could be inlined at this use, but it is a common pattern throughout the
function.

julia
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