2016-08-22 1:00 GMT+03:00 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: > On Sun, 21 Aug 2016, Matwey V. Kornilov wrote: > >> In both cases (with or without HCD_BH), usb_hcd_giveback_urb is called >> every 0.01 sec. It is not clear why behavior is so different. > > What behavior are you asking about? The difference between HCD_BH set > and not set? > The difference between HCD_BH set and not set is that when it is not set then usb_hcd_giveback_urb() receive zero-length URBs. And this breaks my pwc webcam. And the question is how to fix it. As far as I can see, usb_hcd_giveback_urb is being called with the same rate in both cases, so zero-length URBs are probably supposed to be data-carrying. > Alan Stern > -- With best regards, Matwey V. Kornilov. Sternberg Astronomical Institute, Lomonosov Moscow State University, Russia 119991, Moscow, Universitetsky pr-k 13, +7 (495) 9392382 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
