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From: Ming Lei <tom.leiming@gmail.com>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: linux-pm@lists.linux-foundation.org,
	Kevin Hilman <khilman@ti.com>,
	"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, 1 Jul 2011 19:32:33 +0800	[thread overview]
Message-ID: <BANLkTimRRZ9Ld5rtpQMT3PhmOCn+qOxBcQ@mail.gmail.com> (raw)
In-Reply-To: <201107010233.12377.rjw@sisk.pl>

Hi,

On Fri, Jul 1, 2011 at 8:33 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, but also I'm not sure
> whether or not that's used by USB.  Moreover, even if that doesn't happen
> right now, it may start to happen at one point.

It should be used by USB, for example, uvcvideo driver has enabled
auto suspend already:

    - rmmod uvcvideo

    - usb video class device auto suspended

    - modprobe uvcvideo       #driver_probe_device()


thanks,
-- 
Ming Lei
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  parent reply	other threads:[~2011-07-01 11:32 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
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     ` Ming Lei [this message]
2011-07-01 14:54   ` [linux-pm] " 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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