linux-kernel - Re: [RFC PATCH 09/15] ata: ti_sata: Add Texas Instruments SATA Wrapper driver

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Date:	Wed, 25 Sep 2013 14:49:56 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Roger Quadros <rogerq@...com>
Cc:	balbi@...com, bcousson@...libre.com, tony@...mide.com,
	balajitk@...com, kishon@...com, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Tejun Heo <tj@...nel.org>
Subject: Re: [RFC PATCH 09/15] ata: ti_sata: Add Texas Instruments SATA Wrapper
 driver

On Wednesday, September 25, 2013 02:37:19 PM Bartlomiej Zolnierkiewicz wrote:

[...]

> > +#ifdef CONFIG_PM
> > +
> > +static int ti_sata_resume(struct device *dev)
> > +{
> > +	pm_runtime_disable(dev);
> > +	pm_runtime_set_active(dev);
> > +	pm_runtime_enable(dev);
> 
> This doesn't look like a correct ->resume method:
> * it shouldn't touch runtime PM at all
> * for each ->resume method there should be a corresponding ->suspend method
> 
> Moreover this whole wrapper driver seems strange, why not just add a proper
> runtime PM support to ahci_platform driver instead?

Hmm, even this shouldn't be needed as this wrapper driver doesn't have
->runtime_suspend and ->runtime resume methods.

What exactly is the purpose of the existence of this wrapper driver?

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

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