svnet: reduced wakelock time

Change-Id: I9b00d89120bae47f02ffd2ef1097c6362b761bce
Signed-off-by: zwliew <zhaoweiliew@gmail.com>
ipv4: saved cpu cycles from check_leaf()

Change-Id: Ibf394ffcc2f2c47b73e07d688f83a2383a7c0553
Signed-off-by: zwliew <zhaoweiliew@gmail.com>