Merge aivanov@bk-internal.mysql.com:/home/bk/mysql-5.1-new

into  mysql.com:/home/alexi/bugs/mysql-5.1-15758

sql/sql_cache.cc

@@ -830,6 +830,11 @@ sql mode: 0x%lx, sort len: %lu, conncat len: %lu",
                           flags.sql_mode,
                           flags.max_sort_length,
                           flags.group_concat_max_len));
+    /*
+     Make InnoDB to release the adaptive hash index latch before
+     acquiring the query cache mutex.
+    */
+    ha_release_temporary_latches(thd);
     STRUCT_LOCK(&structure_guard_mutex);
 
     if (query_cache_size == 0)

sql/sql_cursor.cc

@@ -445,9 +445,8 @@ Sensitive_cursor::fetch(ulong num_rows)
   if (error == NESTED_LOOP_CURSOR_LIMIT)
     join->resume_nested_loop= TRUE;
 
-#ifdef USING_TRANSACTIONS
     ha_release_temporary_latches(thd);
-#endif
+
   /* Grab free_list here to correctly free it in close */
   thd->restore_active_arena(this, &backup_arena);