Re: [PATCH] usb:cdns3: Fix for CV CH9 running with g_zero driver.
From: Peter Chen
Date: Tue Oct 08 2019 - 22:28:37 EST
On 19-10-08 15:58:57, Felipe Balbi wrote:
> Peter Chen <peter.chen@xxxxxxx> writes:
> > On 19-10-07 07:39:11, Pawel Laszczak wrote:
> >> Patch fixes issue with Halt Endnpoint Test observed
> > %s/Endnpoint/Endpoint
> >> during using g_zero
> >> driver as DUT. Bug occurred only on some testing board.
> > g_zero is legacy, please use configfs function source_sink or loopback
> > instead.
> We still want fixes for those ;-)
Yes, g_zero also uses source_sink and loopback, we just suggest the user
configfs instead of legacy modules.
> >> Endpoint can defer transition to Halted state if endpoint has pending
> >> requests.
> > The implementation of halt handling is a little complicated, you may
> > consider return -EAGAIN for functional stall through usb_ep_set_halt
> > from function driver if the requests are pending, it doesn't need to
> > defer such kinds of functional stall.
> -EAGAIN, IIRC is only supposed to be used for IN endpoint stalls.
Yes, you are right.