Description: Fix timing issues on USB3 or fast recent hardware.  Back-port from upstream.
Author: Michael Thayer <michael dot thayer at oracle dot com>
Origin: upstream, http://anonscm.debian.org/cgit/sane/sane-backends.git/commit/?id=09daef4a681e43a411b14389ceee9292ffbc29fc, http://anonscm.debian.org/cgit/sane/sane-backends.git/commit/?id=425edc705e6323353bf99f58c277dc4f0fe47deb
Bug-Ubuntu: https://launchpad.net/bugs/1184699
Forwarded: not-needed
Last-Update: 2015-08-21

--- sane-backends-1.0.25+git20150528.orig/backend/genesys_low.c
+++ sane-backends-1.0.25+git20150528/backend/genesys_low.c
@@ -943,13 +943,18 @@ sanei_genesys_get_triple(Genesys_Registe
   return SANE_STATUS_GOOD;
 }
 
-/* Checks if the scan buffer is empty */
+/** @brief Check if the scanner's internal data buffer is empty
+ * @param *dev device to test for data
+ * @param *empty return value
+ * @return empty will be set to SANE_TRUE if there is no scanned data.
+ **/
 SANE_Status
 sanei_genesys_test_buffer_empty (Genesys_Device * dev, SANE_Bool * empty)
 {
   uint8_t val = 0;
   SANE_Status status;
 
+  usleep(1000);
   status = sanei_genesys_get_status (dev, &val);
   if (status != SANE_STATUS_GOOD)
     {
@@ -961,6 +966,10 @@ sanei_genesys_test_buffer_empty (Genesys
 
   if (dev->model->cmd_set->test_buffer_empty_bit (val))
     {
+      /* fix timing issue on USB3 (or just may be too fast) hardware
+       * spotted by John S. Weber jweber53@gmail.com
+       */
+      usleep(1000);
       DBG (DBG_io2, "sanei_genesys_test_buffer_empty: buffer is empty\n");
       *empty = SANE_TRUE;
       return SANE_STATUS_GOOD;