void __hwspin_unlock()

in hwspinlock_core.c [265:302]

• 21 lines of code
• 8 McCabe index (conditional complexity)

void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
{
	if (WARN_ON(!hwlock || (!flags && mode == HWLOCK_IRQSTATE)))
		return;

	/*
	 * We must make sure that memory operations (both reads and writes),
	 * done before unlocking the hwspinlock, will not be reordered
	 * after the lock is released.
	 *
	 * That's the purpose of this explicit memory barrier.
	 *
	 * Note: the memory barrier induced by the spin_unlock below is too
	 * late; the other core is going to access memory soon after it will
	 * take the hwspinlock, and by then we want to be sure our memory
	 * operations are already observable.
	 */
	mb();

	hwlock->bank->ops->unlock(hwlock);

	/* Undo the spin_trylock{_irq, _irqsave} called while locking */
	switch (mode) {
	case HWLOCK_IRQSTATE:
		spin_unlock_irqrestore(&hwlock->lock, *flags);
		break;
	case HWLOCK_IRQ:
		spin_unlock_irq(&hwlock->lock);
		break;
	case HWLOCK_RAW:
	case HWLOCK_IN_ATOMIC:
		/* Nothing to do */
		break;
	default:
		spin_unlock(&hwlock->lock);
		break;
	}
}