linux-kernel - Re: [PATCH v11 10/27] iommu/exynos: use managed device helper functions

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Date:	Wed, 19 Mar 2014 17:56:01 +0900
From:	Cho KyongHo <pullip.cho@...sung.com>
To:	Jingoo Han <jg1.han@...sung.com>
Cc:	'Tomasz Figa' <t.figa@...sung.com>,
	'Linux ARM Kernel' <linux-arm-kernel@...ts.infradead.org>,
	'Linux DeviceTree' <devicetree@...r.kernel.org>,
	'Linux IOMMU' <iommu@...ts.linux-foundation.org>,
	'Linux Kernel' <linux-kernel@...r.kernel.org>,
	'Linux Samsung SOC' <linux-samsung-soc@...r.kernel.org>,
	'Antonios Motakis' <a.motakis@...tualopensystems.com>,
	'Grant Grundler' <grundler@...omium.org>,
	'Joerg Roedel' <joro@...tes.org>,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Prathyush' <prathyush.k@...sung.com>,
	'Rahul Sharma' <rahul.sharma@...sung.com>,
	'Sachin Kamat' <sachin.kamat@...aro.org>,
	'Sylwester Nawrocki' <s.nawrocki@...sung.com>,
	'Varun Sethi' <Varun.Sethi@...escale.com>
Subject: Re: [PATCH v11 10/27] iommu/exynos: use managed device helper functions

On Wed, 19 Mar 2014 08:59:09 +0900, Jingoo Han wrote:
> On Wednesday, March 19, 2014 12:12 AM, Tomasz Figa wrote:
> > On 18.03.2014 11:38, Cho KyongHo wrote:
> > > On Fri, 14 Mar 2014 14:28:36 +0100, Tomasz Figa wrote:
> > >> On 14.03.2014 06:05, Cho KyongHo wrote:
> > >>> This patch uses managed device helper functions in the probe().
> > >>>
> > >>> Signed-off-by: Cho KyongHo <pullip.cho@...sung.com>
> > >>> ---
> > >>>    drivers/iommu/exynos-iommu.c |   64 +++++++++++++++++-------------------------
> > >>>    1 file changed, 26 insertions(+), 38 deletions(-)
> > >>>
> > >>> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> > >>> index 36e6b73..33b424d 100644
> > >>> --- a/drivers/iommu/exynos-iommu.c
> > >>> +++ b/drivers/iommu/exynos-iommu.c
> 
> [.....]
> 
> > >>>    	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > >>>    	if (!res) {
> > >>> -		dev_dbg(dev, "Unable to find IOMEM region\n");
> > >>> -		ret = -ENOENT;
> > >>> -		goto err_init;
> > >>> +		dev_err(dev, "Unable to find IOMEM region\n");
> > >>> +		return -ENOENT;
> > >>>    	}
> > >>
> > >> No need to check for error and print message, because
> > >> devm_ioremap_resource() already checks the passed resource and handles
> > >> error cases.
> > >>
> > >
> > > Yes but devm_ioremap_resource() just tells that the given 'res' is not
> > > correct. I think the message in the driver is more informative.
> > 
> > The common practice used in Linux kernel is to not duplicate such
> > messages. It is obvious that devm_ioremap_resource() printing such
> > message is related to an IOMEM resource anyway, as you can't used it
> > with other types of resources.
> 
> +1
> 
> I agree with Tomasz Figa's opinion.
> These messages have been being removed from Linux kernel.
> Thank you.
> 
Ok.

Thank you for the advice.

Kyong Ho 
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