static int idt82p33_measure_tod_write_9_byte_overhead()

in ptp_idt82p33.c [400:435]

• 27 lines of code
• 4 McCabe index (conditional complexity)

static int idt82p33_measure_tod_write_9_byte_overhead(
			struct idt82p33_channel *channel)
{
	struct idt82p33 *idt82p33 = channel->idt82p33;
	u8 buf[TOD_BYTE_COUNT];
	ktime_t start, stop;
	s64 total_ns;
	int err = 0;
	u8 i, j;

	total_ns = 0;
	idt82p33->tod_write_overhead_ns = 0;

	for (i = 0; i < MAX_MEASURMENT_COUNT; i++) {

		start = ktime_get_raw();

		/* Need one less byte for applicable overhead */
		for (j = 0; j < (TOD_BYTE_COUNT - 1); j++) {
			err = idt82p33_write(idt82p33,
					     channel->dpll_tod_cnfg + i,
					     &buf[i], sizeof(buf[i]));
			if (err)
				return err;
		}

		stop = ktime_get_raw();

		total_ns += ktime_to_ns(stop) - ktime_to_ns(start);
	}

	idt82p33->tod_write_overhead_ns = div_s64(total_ns,
						  MAX_MEASURMENT_COUNT);

	return err;
}