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

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Message-ID: <alpine.DEB.2.02.1308191222200.2313@hadrien>
Date:	Mon, 19 Aug 2013 12:23:33 +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, 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 12:12, schrieb Julia Lawall:
> > 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.
> >
> in other functions this looks like that:
> r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
>
> i did not dive into the driver but from the part i see makeing this into:
>
>  es = platform_get_resource_byname(pdev, IORESOURCE_MEM,"base-address");
>
> would render pname obsolete.

This function always uses pname for platform_get_resource_byname (4 calls)
and of_property_read_u32 (2 calls).  So perhaps it is better to leave it
as is.

julia

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