Merge mysql.com:/home/svoj/devel/mysql/BUG28574/mysql-5.0-engines

into  mysql.com:/home/svoj/devel/mysql/BUG28574/mysql-5.1-engines

sql/lock.cc

@@ -197,6 +197,13 @@ MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **tables, uint count,
     }
     else if (rc == 1)                           /* aborted */
     {
+      /*
+        reset_lock_data is required here. If thr_multi_lock fails it
+        resets lock type for tables, which were locked before (and
+        including) one that caused error. Lock type for other tables
+        preserved.
+      */
+      reset_lock_data(sql_lock);
       thd->some_tables_deleted=1;		// Try again
       sql_lock->lock_count= 0;                  // Locks are already freed
     }