[linux-pm] runtime PM usage_count during driver_probe_device()?

[Ohad Ben-Cohen]

On Fri, Jul 1, 2011 at 3:33 AM, Rafael J. Wysocki <rjw at 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.