ha_innodb.h, ha_innodb.cc:

  Remove the flag HA_NOT_READ_PREFIX_LAST because ORDER BY orders wrong then; also remove the diagnostic print to avoid cluttering the error log

sql/ha_innodb.cc

@@ -2180,9 +2180,9 @@ convert_search_mode_to_innobase(
 		case HA_READ_BEFORE_KEY:	return(PAGE_CUR_L);
 		case HA_READ_PREFIX:		return(PAGE_CUR_GE);
 		case HA_READ_PREFIX_LAST:
-		        ut_print_timestamp(stderr);
+		  /*		        ut_print_timestamp(stderr);
                         fprintf(stderr,
-			  " InnoDB: Warning: Using HA_READ_PREFIX_LAST\n");
+			" InnoDB: Warning: Using HA_READ_PREFIX_LAST\n"); */
 		        return(PAGE_CUR_LE);
 
 		        /* InnoDB does not yet support ..PREFIX_LAST!

sql/ha_innodb.h

@@ -81,8 +81,11 @@ class ha_innobase: public handler
 			  HA_NO_WRITE_DELAYED |
 			  HA_PRIMARY_KEY_IN_READ_INDEX |
 			  HA_DROP_BEFORE_CREATE |
+			  /* We should also list HA_NOT_READ_PREFIX_LAST
+			     here but it currently seems to break ORDER BY;
+			     until release 4.0.5 some LIKE 'abc%' ... DESC
+			     queries will not work correctly */
 			  HA_NO_PREFIX_CHAR_KEYS |
-			  HA_NOT_READ_PREFIX_LAST |
 			  HA_TABLE_SCAN_ON_INDEX),
 	  last_dup_key((uint) -1),
 	  start_of_scan(0)