static void calibrate_port()

in generators/pps_gen_parport.c [143:165]

• 19 lines of code
• 2 McCabe index (conditional complexity)

static void calibrate_port(struct pps_generator_pp *dev)
{
	struct parport *port = dev->pardev->port;
	int i;
	long acc = 0;

	for (i = 0; i < (1 << PORT_NTESTS_SHIFT); i++) {
		struct timespec64 a, b;
		unsigned long irq_flags;

		local_irq_save(irq_flags);
		ktime_get_real_ts64(&a);
		port->ops->write_control(port, NO_SIGNAL);
		ktime_get_real_ts64(&b);
		local_irq_restore(irq_flags);

		b = timespec64_sub(b, a);
		acc += timespec64_to_ns(&b);
	}

	dev->port_write_time = acc >> PORT_NTESTS_SHIFT;
	pr_info("port write takes %ldns\n", dev->port_write_time);
}