linux-kernel - Re: [PATCH 4/6 v2] usb: musb: dsps: simplify platform_get_resource_byname/devm_ioremap

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Date:	Mon, 19 Aug 2013 16:32:56 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
cc:	Svenning Sørensen <sss@...omea.dk>,
	Felipe Balbi <balbi@...com>, kernel-janitors@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6 v2] usb: musb: dsps: simplify
 platform_get_resource_byname/devm_ioremap_resource



On Mon, 19 Aug 2013, Sergei Shtylyov wrote:

> Hello.
>
> On 08/19/2013 03:47 PM, Julia Lawall wrote:
>
> > 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>
>
> > This patch also adjusts the error-handling code on the call to
> > devm_ioremap_resource to check the right value, noticed by Svenning
> > Sørensen.
>
>    Saying "also" in the changelog is usuallly a good sign the patch should be
> split.

OK, the original patch already does the first part.  I will send a new
patch for the bug fix.

julia

>
> > Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
>
> > ---
> > v2: Fixed the bug on the test of the result of devm_ioremap_resource
>
> >   drivers/usb/musb/musb_dsps.c |    7 ++-----
> >   1 file changed, 2 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
> > index 4ffbaac..e60be6f 100644
> > --- a/drivers/usb/musb/musb_dsps.c
> > +++ b/drivers/usb/musb/musb_dsps.c
> > @@ -357,12 +357,9 @@ static int dsps_musb_init(struct musb *musb)
> >   	u32 rev, val;
> >
> >   	r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
> > -	if (!r)
> > -		return -EINVAL;
> > -
> >   	reg_base = devm_ioremap_resource(dev, r);
> > -	if (!musb->ctrl_base)
> > -		return -EINVAL;
> > +        if (IS_ERR(reg_base))
> > +		return PTR_ERR(reg_base);
>
>    This is indented with space, not tabs. And of course, this was a matter of
> a separate *fix* patch, while the original patch was a *cleanup*.
>
> WBR, Sergei
>
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