vfree() does it's own NULL checking,so no need for check before calling it. 'pages' is local variable argment,so in v2, it is no need assignment to NULL. Signed-off-by: Figo.zhang <figo1802@gmail.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>