int __hwspin_lock_timeout()

in hwspinlock_core.c [206:243]

• 24 lines of code
• 7 McCabe index (conditional complexity)

int __hwspin_lock_timeout(struct hwspinlock *hwlock, unsigned int to,
					int mode, unsigned long *flags)
{
	int ret;
	unsigned long expire, atomic_delay = 0;

	expire = msecs_to_jiffies(to) + jiffies;

	for (;;) {
		/* Try to take the hwspinlock */
		ret = __hwspin_trylock(hwlock, mode, flags);
		if (ret != -EBUSY)
			break;

		/*
		 * The lock is already taken, let's check if the user wants
		 * us to try again
		 */
		if (mode == HWLOCK_IN_ATOMIC) {
			udelay(HWSPINLOCK_RETRY_DELAY_US);
			atomic_delay += HWSPINLOCK_RETRY_DELAY_US;
			if (atomic_delay > to * 1000)
				return -ETIMEDOUT;
		} else {
			if (time_is_before_eq_jiffies(expire))
				return -ETIMEDOUT;
		}

		/*
		 * Allow platform-specific relax handlers to prevent
		 * hogging the interconnect (no sleeping, though)
		 */
		if (hwlock->bank->ops->relax)
			hwlock->bank->ops->relax(hwlock);
	}

	return ret;
}