예제 #1
0
파일: cdc-acm.c 프로젝트: IgnasD/Tomato-RAF
static int acm_write_start(struct acm *acm, int wbn)
{
	unsigned long flags;
	struct acm_wb *wb;
	int rc;

	spin_lock_irqsave(&acm->write_lock, flags);
	if (!acm->dev) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return -ENODEV;
	}

	if (!acm->write_ready) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;	/* A white lie */
	}

	wb = &acm->wb[wbn];
	if(acm_wb_is_avail(acm) <= 1)
		acm->write_ready = 0;

	dbg("%s susp_count: %d", __FUNCTION__, acm->susp_count);
	if (acm->susp_count) {
		acm->old_ready = acm->write_ready;
		acm->delayed_wb = wb;
		acm->write_ready = 0;
		schedule_work(&acm->waker);
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;	/* A white lie */
	}
	usb_mark_last_busy(acm->dev);

	if (!acm_wb_is_used(acm, wbn)) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;
	}

	rc = acm_start_wb(acm, wb);
	spin_unlock_irqrestore(&acm->write_lock, flags);

	return rc;

}
예제 #2
0
/*
 * Poke write.
 */
static int acm_write_start(struct acm *acm)
{
	unsigned long flags;
	int wbn;
	struct acm_wb *wb;
	int rc;

	spin_lock_irqsave(&acm->write_lock, flags);
	if (!acm->dev) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return -ENODEV;
	}

	if (!acm->write_ready) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;	/* A white lie */
	}

	wbn = acm->write_current;
	if (!acm_wb_is_used(acm, wbn)) {
		spin_unlock_irqrestore(&acm->write_lock, flags);
		return 0;
	}
	wb = &acm->wb[wbn];

	acm->write_ready = 0;
	spin_unlock_irqrestore(&acm->write_lock, flags);

	acm->writeurb->transfer_buffer = wb->buf;
	acm->writeurb->transfer_dma = wb->dmah;
	acm->writeurb->transfer_buffer_length = wb->len;
	acm->writeurb->dev = acm->dev;

	if ((rc = usb_submit_urb(acm->writeurb, GFP_ATOMIC)) < 0) {
		dbg("usb_submit_urb(write bulk) failed: %d", rc);
		acm_write_done(acm);
	}
	return rc;
}