FEEDBACK_URB_PACKETS
FEEDBACK_PACKET_SIZE * FEEDBACK_URB_PACKETS;
usb_alloc_urb(FEEDBACK_URB_PACKETS, GFP_KERNEL);
f_urb->number_of_packets = FEEDBACK_URB_PACKETS;
FEEDBACK_URB_PACKETS * FEEDBACK_PACKET_SIZE;
for (j = 0; j < FEEDBACK_URB_PACKETS; j++) {