hi Mathias: > > In xhci-ring.c, static int xhci_queue_isoc_tx(): > > /* Calculate TRB length */ > trb_buff_len = TRB_MAX_BUFF_SIZE - (addr & ((1 << TRB_MAX_BUFF_SHIFT) - 1)); > > where addr = start_addr + urb->iso_frame_desc[i].offset; > > this limits the trb_buff_len to stop the trb buffer at TRB_MAX_BUFF_SIZE boundary Yes, you are right. the above is make sure trb buffer will not cross over TRB_MAX_BUFF_SIZE boundary. But it still possible to cross the page boundary for ISO trb, right? (suppose page boundary is 4KB, TRB_MAX_BUFF_SIZE is 64KB) appreciate your kind help, -- 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
