irqreturn_t vbg_core_isr()

in vboxguest/vboxguest_core.c [1776:1826]

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

irqreturn_t vbg_core_isr(int irq, void *dev_id)
{
	struct vbg_dev *gdev = dev_id;
	struct vmmdev_events *req = gdev->ack_events_req;
	bool mouse_position_changed = false;
	unsigned long flags;
	u32 events = 0;
	int rc;

	if (!gdev->mmio->V.V1_04.have_events)
		return IRQ_NONE;

	/* Get and acknowlegde events. */
	req->header.rc = VERR_INTERNAL_ERROR;
	req->events = 0;
	rc = vbg_req_perform(gdev, req);
	if (rc < 0) {
		vbg_err("Error performing events req, rc: %d\n", rc);
		return IRQ_NONE;
	}

	events = req->events;

	if (events & VMMDEV_EVENT_MOUSE_POSITION_CHANGED) {
		mouse_position_changed = true;
		events &= ~VMMDEV_EVENT_MOUSE_POSITION_CHANGED;
	}

	if (events & VMMDEV_EVENT_HGCM) {
		wake_up(&gdev->hgcm_wq);
		events &= ~VMMDEV_EVENT_HGCM;
	}

	if (events & VMMDEV_EVENT_BALLOON_CHANGE_REQUEST) {
		schedule_work(&gdev->mem_balloon.work);
		events &= ~VMMDEV_EVENT_BALLOON_CHANGE_REQUEST;
	}

	if (events) {
		spin_lock_irqsave(&gdev->event_spinlock, flags);
		gdev->pending_events |= events;
		spin_unlock_irqrestore(&gdev->event_spinlock, flags);

		wake_up(&gdev->event_wq);
	}

	if (mouse_position_changed)
		vbg_linux_mouse_event(gdev);

	return IRQ_HANDLED;
}