linux-kernel - Re: [PATCH v11 17/27] iommu/exynos: remove calls to Runtime PM API functions

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Message-ID: <CANEJEGtK-XfTef3ko+Yq2RNFXohhuQjgamr-DRBmxR-SNzgkJg@mail.gmail.com>
Date:	Wed, 19 Mar 2014 09:54:39 -0700
From:	Grant Grundler <grundler@...omium.org>
To:	Tomasz Figa <t.figa@...sung.com>
Cc:	Cho KyongHo <pullip.cho@...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 17/27] iommu/exynos: remove calls to Runtime PM API functions

On Wed, Mar 19, 2014 at 6:12 AM, Tomasz Figa <t.figa@...sung.com> wrote:
...
>> Device driver is not only for the scholarship but also for the real use.
>
> Huh? I'm not sure what kind of comment is this.

I'm guessing Cho meant: "This isn't an academic exercise - I have a
real use case that requires reference counting."

Cho needs to be more specific about his "Some driver needs enabling
sysmmu" example. Then others would understand why/when the reference
counting is needed. Ie walk through a real driver that exists today
that depends on reference counting.

cheers,
grant
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