[PATCH v7 1/2] drivers: base: add support for registering notifier about deferred probe

Greg Kroah-Hartman gregkh at linuxfoundation.org
Thu Apr 14 14:51:39 PDT 2016

On Thu, Apr 14, 2016 at 10:33:22PM +0100, Russell King - ARM Linux wrote:
> The problem that's being addressed here is that there's no way at the
> moment to know when the drivers on a different bus (namely the platform
> bus) have probed and are providing the clock and power domain resources
> necessary to be able to read these identifying values.
> I guess if you don't like a notifier, the other alternative is to
> setup a delayed workqueue and have the workqueue repeatedly attempt
> to register the devices until they all succeed.  That's not
> particularly nice, because we'd be wasting CPU cycles running
> that workqueue for no reason until all the devices get registered.

I like that idea, it handles the issue of this crazy hardware where it
belongs, in that bus subsystem :)


greg k-h

More information about the linux-arm-kernel mailing list