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

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Message-ID: <20130819144436.GI22811@mwanda>
Date:	Mon, 19 Aug 2013 17:44:36 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	Julia Lawall <julia.lawall@...6.fr>,
	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, Aug 19, 2013 at 06:29:37PM +0400, 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.
> 
> >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*.
> 

I would say this falls under the "trivial and closely related"
banner.  But I would prefer if the changelog said "Fixed a bug,
also made some cleanups."  Especially I wish the subject mentioned
the bugfix.

regards,
dan carpenter

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