Re: [PATCH] usb: Add support for runtime power management of the hcd

Matthew Garrett
2009-11-12T17:00:12Z

On Thu, Nov 12, 2009 at 06:00:02PM +0100, Oliver Neukum wrote:

> Exactly, but that isn't the same as needing two attributes exported to user
> space. That is an absolute requirement only if we can't tell what a device's
> capabilities are.

Right. I don't see any reason for runtime wakeup to be exposed to
userspace - it's an entirely orthogonal concept to system wakeup. The
relevant userspace policy is whether or not runtime pm is enabled.

> We could introduce a second attribute if we want to prevent drivers from
> using remote wakeup to do runtime power management, but it is not
> required. We could simply not give user space that choice.

Absolutely.

--
Matthew Garrett | mjg59@srcf.ucam.org