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From: Kevin Hilman <khilman@ti.com>
To: Ohad Ben-Cohen <ohad@wizery.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
	linux-pm@lists.linux-foundation.org,
	"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
	Alan Stern <stern@rowland.harvard.edu>
Subject: Re: [linux-pm] runtime PM usage_count during driver_probe_device()?
Date: Fri, 01 Jul 2011 07:46:37 -0700	[thread overview]
Message-ID: <874o366otu.fsf@ti.com> (raw)
In-Reply-To: <BANLkTikLna-jbrNfD2fz_QC1BfrCHpByNA@mail.gmail.com> (Ohad Ben-Cohen's message of "Fri, 1 Jul 2011 08:57:40 +0300")

Ohad Ben-Cohen <ohad@wizery.com> writes:

> 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.  Then, 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.

Thanks, this makes sense.

Maybe runtime_pm.txt should be updated to explain this as well.

Kevin
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  reply	other threads:[~2011-07-01 14:46 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-30 22:19 runtime PM usage_count during driver_probe_device()? Kevin Hilman
2011-07-01  0:09 ` Kevin Hilman
2011-07-01  0:09 ` Kevin Hilman
2011-07-01  0:33   ` Rafael J. Wysocki
2011-07-01  0:33   ` [linux-pm] " Rafael J. Wysocki
2011-07-01  5:57     ` Ohad Ben-Cohen
2011-07-01 14:46       ` Kevin Hilman [this message]
2011-07-01 14:46       ` Kevin Hilman
2011-07-01  5:57     ` Ohad Ben-Cohen
2011-07-01 11:32     ` Ming Lei
2011-07-01 11:32     ` [linux-pm] " Ming Lei
2011-07-01 14:54   ` Alan Stern
2011-07-01 21:13     ` [PATCH] PM: prevent runtime_resume from racing with probe Alan Stern
2011-07-01 21:42       ` Rafael J. Wysocki
2011-07-01 14:54   ` runtime PM usage_count during driver_probe_device()? Alan Stern
2011-07-01 14:43 ` [linux-pm] " Alan Stern
2011-07-01 14:43 ` Alan Stern
2011-07-01 14:44 ` Kevin Hilman
2011-07-01 15:25   ` Alan Stern
2011-07-01 15:25   ` [linux-pm] " Alan Stern
2011-07-01 15:45     ` Kevin Hilman
2011-07-01 15:59       ` Alan Stern
2011-07-01 16:54         ` Kevin Hilman
2011-07-01 16:54         ` Kevin Hilman
2011-07-01 15:59       ` Alan Stern
2011-07-01 20:53       ` Rafael J. Wysocki
2011-07-01 20:53       ` [linux-pm] " Rafael J. Wysocki
2011-07-01 21:12         ` Alan Stern
2011-07-01 21:44           ` Rafael J. Wysocki
2011-07-01 21:44           ` [linux-pm] " Rafael J. Wysocki
2011-07-01 22:12           ` [PATCH] PM / Runtime: Update documentation regarding driver removal Rafael J. Wysocki
2011-07-01 22:49             ` Kevin Hilman
2011-07-01 22:49             ` Kevin Hilman
2011-07-01 22:12           ` Rafael J. Wysocki
2011-07-01 21:12         ` runtime PM usage_count during driver_probe_device()? Alan Stern
2011-07-01 15:45     ` Kevin Hilman
2011-07-01 14:44 ` Kevin Hilman
2011-07-01 21:42 ` Rafael J. Wysocki
2011-07-01 21:42 ` [linux-pm] " Rafael J. Wysocki

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