Hi,
On Fri, Jul 1, 2011 at 8:33 AM, Rafael J. Wysocki <rjw@xxxxxxx> 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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