On Mon, May 09, 2022 at 07:53:41PM +0530, Pavan Kondeti wrote: > On Mon, May 09, 2022 at 10:08:41AM -0400, Alan Stern wrote: > > BTW, if there's any trouble with getting device_wakeup_path() to work > > the way you want, you could consider instead calling > > usb_wakeup_enabled_descendants() on the root hub. This function returns > > a count of the number of wakeup-enabled USB devices at or below the > > device you pass to it. > > > > This series [1] started with usb_wakeup_enabled_descendants() actually. one > of the problem with this API is that we have to call this on both USB2.0 and > USB3.0 root hubs. Do you think we can have a wrapper function like > usb_hcd_wakeup_enabled_descendants() that accepts hcd as an argument and > internally call usb_wakeup_enabled_descendants() on both root hubs and return > the result. Sure you can. Feel free to write such a function and add it to hcd.c. Ideally it should work for host controllers with any number of root hubs, just adding up the number of wakeup-enabled descendants for all of them. Alan Stern
