On Mon, 12 Dec 2016, Krzysztof Opasiak wrote:
> > Ah, good, that clears it up. The problem is that stop_activity() nukes
> > all the endpoints except for endpoint 0!
> >
> > The patch below should fix the problem.
> >
> > Alan Stern
> >
> >
> >
> > Index: usb-4.x/drivers/usb/gadget/udc/dummy_hcd.c
> > ===================================================================
> > --- usb-4.x.orig/drivers/usb/gadget/udc/dummy_hcd.c
> > +++ usb-4.x/drivers/usb/gadget/udc/dummy_hcd.c
> > @@ -338,6 +338,7 @@ static void stop_activity(struct dummy *
> > /* The timer is left running so that outstanding URBs can fail */
> >
> > /* nuke any pending requests first, so driver i/o is quiesced */
> > + nuke(dum, &dum->ep[0]);
> > list_for_each_entry(ep, &dum->gadget.ep_list, ep.ep_list)
> > nuke(dum, ep);
>
> Pretty nasty error. We had the same in vUDC. Maybe it would be a good
> idea to iterate over ep[] array which is inside struct dummy instead
> adding this special case for ep[0]. In addition it's the only place
> where dummy_hcd iterates over this list instead of ep array;)
Yeah, that's a good idea. Here's a revised patch; it should work just
as well as the original.
Alan Stern
Index: usb-4.x/drivers/usb/gadget/udc/dummy_hcd.c
===================================================================
--- usb-4.x.orig/drivers/usb/gadget/udc/dummy_hcd.c
+++ usb-4.x/drivers/usb/gadget/udc/dummy_hcd.c
@@ -330,7 +330,7 @@ static void nuke(struct dummy *dum, stru
/* caller must hold lock */
static void stop_activity(struct dummy *dum)
{
- struct dummy_ep *ep;
+ int i;
/* prevent any more requests */
dum->address = 0;
@@ -338,8 +338,8 @@ static void stop_activity(struct dummy *
/* The timer is left running so that outstanding URBs can fail */
/* nuke any pending requests first, so driver i/o is quiesced */
- list_for_each_entry(ep, &dum->gadget.ep_list, ep.ep_list)
- nuke(dum, ep);
+ for (i = 0; i < DUMMY_ENDPOINTS; ++i)
+ nuke(dum, &dum->ep[i]);
/* driver now does any non-usb quiescing necessary */
}
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