From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ohad Ben-Cohen <ohad@wizery.com>
Subject: Re: runtime PM usage_count during driver_probe_device()?
Date: Fri, 1 Jul 2011 08:57:40 +0300
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References: <87k4c3dktm.fsf@ti.com> <87vcvmaml6.fsf@ti.com>
	<201107010233.12377.rjw@sisk.pl>
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To: "Rafael J. Wysocki" <rjw@sisk.pl>
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On Fri, Jul 1, 2011 at 3:33 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> In theory it is possible that a subsystem (e.g. bus type) will enable
> runtime PM for devices without drivers and will (for example) put them
> into low power states until the drivers are loaded. =A0Then, it makes
> sense for the core to prevent such transitions from racing with .probe().
>
> I'm not sure if this happens in practice, though,

Yeah, this is exactly what the SDIO subsystem is doing.