linux-kernel - Re: [PATCH] Convert MMC subsys drivers to dev_pm

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Date:	Sat, 22 Aug 2009 10:16:38 +0200
From:	Manuel Lauss <manuel.lauss@...glemail.com>
To:	Marek Vasut <marek.vasut@...il.com>
Cc:	Frans Pop <elendil@...net.nl>,
	linux-arm-kernel@...ts.infradead.org, nicolas.ferre@...el.com,
	mirq-linux@...e.qmqm.pl, linux-kernel@...r.kernel.org,
	manuel.lauss@...il.com, ppisa@...ron.com, nico@....org,
	maen@...vell.com, s.hauer@...gutronix.de, tony@...mide.com,
	madhu.cr@...com, drzeus@...eus.cx, ben-linux@...ff.org,
	avorontsov@...mvista.com, pierre@...man.eu,
	sdhci-devel@...ts.ossman.eu, saschasommer@...enet.de,
	oakad@...oo.com, ian@...menth.co.uk, HaraldWelte@...tech.com,
	JosephChan@....com.tw
Subject: Re: [PATCH] Convert MMC subsys drivers to dev_pm_ops

Hi Marek,

On Sat, Aug 22, 2009 at 7:13 AM, Frans Pop<elendil@...net.nl> wrote:
> Marek Vasut wrote:
>> +static struct dev_pm_ops cm710_mmc_pm_ops = {
>> +       .suspend = cb710_mmc_suspend,
>> +       .resume = cb710_mmc_resume,
>> +};
>
> This is almost certainly wrong (same for the other drivers you converted)
> as they now no longer support hibernation, which requires different ops.
> Please see: http://lkml.org/lkml/2009/7/25/118.
>
> You also seem to have handled the #ifndef CONFIG_PM case incorrectly.
> See http://lkml.org/lkml/2009/8/3/253 for an example how it can be done.

In addition to what Frans said, at least for platform drivers you could
avoid adding (mostly) unused platform_device temp vars like these

+       struct platform_device *pdev = to_platform_device(dev);
        struct au1xmmc_host *host = platform_get_drvdata(pdev);

by simply doing
-        struct au1xmmc_host *host = platform_get_drvdata(pdev);
+        struct au1xmmc_host *host = dev_get_drvdata(dev);

What do you think?

Thanks!
      Manuel Lauss
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