--- usb-linux.c.orig	2008-01-12 12:56:09.000000000 +0100
+++ usb-linux.c	2008-01-12 14:02:47.000000000 +0100
@@ -229,12 +229,14 @@
     if (ret < 0) {
         switch(errno) {
         case ETIMEDOUT:
+	    ret = ioctl(s->fd, USBDEVFS_CLEAR_HALT, &(bt.ep));
             return USB_RET_NAK;
         case EPIPE:
         default:
 #ifdef DEBUG
             printf("handle_data: errno=%d\n", errno);
 #endif
+	    ret = ioctl(s->fd, USBDEVFS_CLEAR_HALT, &(bt.ep));
             return USB_RET_STALL;
         }
     } else {