On 12/12/2016 09:09 PM, Alan Stern wrote: > On Mon, 12 Dec 2016, Andrey Konovalov wrote: > >> On Mon, Dec 12, 2016 at 7:44 PM, Alan Stern <st...@rowland.harvard.edu> >> wrote: >>> >>> I'm still puzzled. Can you try running the test with the diagnostic >>> patch below? The resulting kernel log ought to help pin down where the >>> problem comes from. >> >> Sure, here's the log: >> >> usb 1-1: string descriptor 0 read error: -71 >> usb 1-1: New USB device found, idVendor=0000, idProduct=0002 >> usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=7 >> usb 1-1: can't set config #131, error -71 >> usb 1-1: USB disconnect, device number 45 >> gadgetfs: bound to dummy_udc driver >> dummy: stop_activity >> usb 1-1: new full-speed USB device number 46 using dummy_hcd >> gadgetfs: connected >> dummy: queue ffff88006addc300 ep ep0 >> dummy: complete ffff88006addc300 ep ep0 >> dummy: stop_activity >> gadgetfs: disconnected >> gadgetfs: connected >> dummy: queue ffff88006addc300 ep ep0 >> dummy: complete ffff88006addc300 ep ep0 >> dummy: queue ffff88006addc300 ep ep0 >> dummy: complete ffff88006addc300 ep ep0 >> dummy: queue ffff88006addc300 ep ep0 >> dummy: complete ffff88006addc300 ep ep0 >> usb 1-1: config 131 has too many interfaces: 158, using maximum allowed: 32 >> usb 1-1: config 131 has 1 interface, different from the descriptor's value: >> 158 >> dummy: queue ffff88006addc300 ep ep0 >> dummy: stop_activity >> gadgetfs: disconnected >> ------------[ cut here ]------------ >> WARNING: CPU: 1 PID: 4892 at drivers/usb/gadget/udc/dummy_hcd.c:675 >> dummy_free_request+0x153/0x170 > > 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;) Best regards, -- Krzysztof Opasiak Samsung R&D Institute Poland Samsung Electronics -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
