static int ptp_clock_adjtime()

in ptp_clock.c [100:154]

• 45 lines of code
• 13 McCabe index (conditional complexity)

static int ptp_clock_adjtime(struct posix_clock *pc, struct __kernel_timex *tx)
{
	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
	struct ptp_clock_info *ops;
	int err = -EOPNOTSUPP;

	if (ptp_vclock_in_use(ptp)) {
		pr_err("ptp: virtual clock in use\n");
		return -EBUSY;
	}

	ops = ptp->info;

	if (tx->modes & ADJ_SETOFFSET) {
		struct timespec64 ts;
		ktime_t kt;
		s64 delta;

		ts.tv_sec  = tx->time.tv_sec;
		ts.tv_nsec = tx->time.tv_usec;

		if (!(tx->modes & ADJ_NANO))
			ts.tv_nsec *= 1000;

		if ((unsigned long) ts.tv_nsec >= NSEC_PER_SEC)
			return -EINVAL;

		kt = timespec64_to_ktime(ts);
		delta = ktime_to_ns(kt);
		err = ops->adjtime(ops, delta);
	} else if (tx->modes & ADJ_FREQUENCY) {
		long ppb = scaled_ppm_to_ppb(tx->freq);
		if (ppb > ops->max_adj || ppb < -ops->max_adj)
			return -ERANGE;
		if (ops->adjfine)
			err = ops->adjfine(ops, tx->freq);
		else
			err = ops->adjfreq(ops, ppb);
		ptp->dialed_frequency = tx->freq;
	} else if (tx->modes & ADJ_OFFSET) {
		if (ops->adjphase) {
			s32 offset = tx->offset;

			if (!(tx->modes & ADJ_NANO))
				offset *= NSEC_PER_USEC;

			err = ops->adjphase(ops, offset);
		}
	} else if (tx->modes == 0) {
		tx->freq = ptp->dialed_frequency;
		err = 0;
	}

	return err;
}