usb_alloc_noncoherent
stk_urb->transfer_buffer = usb_alloc_noncoherent(dev->udev, sb_size,
uvc_urb->buffer = usb_alloc_noncoherent(udev, size, gfp_flags,
EXPORT_SYMBOL_GPL(usb_alloc_noncoherent);
void *usb_alloc_noncoherent(struct usb_device *dev, size_t size,