Function mips_pic_activate_intr

freebsd/mips/mips/mips_pic.c:551–581

* If @p r references a MIPS interrupt mapped by the MIPS32 interrupt * controller, handle interrupt activation internally. * * Otherwise, delegate directly to intr_activate_irq(). */

 * Otherwise, delegate directly to intr_activate_irq().
 */
int
mips_pic_activate_intr(device_t child, struct resource *r)
{
	struct mips_pic_intr	*intr;
	int			 error;

	/* Is this one of our shared MIPS interrupts? */
	if ((intr = mips_pic_find_intr(r)) == NULL) {
		/* Delegate to standard INTRNG activation */
		return (intr_activate_irq(child, r));
	}

	/* Bump consumer count and request activation if required */
	mtx_lock(&mips_pic_mtx);
	if (intr->consumers == UINT_MAX) {
		mtx_unlock(&mips_pic_mtx);
		return (ENOMEM);
	}

	if (intr->consumers == 0) {
		if ((error = intr_activate_irq(child, r))) {
			mtx_unlock(&mips_pic_mtx);
			return (error);
		}
	}

	intr->consumers++;
	mtx_unlock(&mips_pic_mtx);

	return (0);
}

/**
 * If @p r references a MIPS interrupt mapped by the MIPS32 interrupt