--- ../libusb-0.1.12-orig/linux.c	2006-03-04 11:52:46 +0900
+++ linux.c	2007-12-26 13:20:43 +0900
@@ -219,7 +219,7 @@
 restart:
     waiting = 1;
     context = NULL;
-    while (!urb.usercontext && ((ret = ioctl(dev->fd, IOCTL_USB_REAPURBNDELAY, &context)) == -1) && waiting) {
+    while (!urb.usercontext && ((ret = ioctl(dev->fd, IOCTL_USB_REAPURBNDELAY, &context)) == -1) && errno == EAGAIN && waiting) {
       tv.tv_sec = 0;
       tv.tv_usec = 1000; // 1 msec
       select(dev->fd + 1, NULL, &writefds, NULL, &tv); //sub second wait