Author: Julia Lawall <julia@diku.dk> alloc_tty_driver is called at the beginning of the function containing the lines of code shown in the patch. Thus, put_tty_driver is needed before returning in the error handling code. The semantic match that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // @nr exists@ local idexpression x; expression E,f; position p1,p2,p3; identifier …