Function crypto_kinvoke

freebsd/opencrypto/crypto.c:1611–1655

* Dispatch an asymmetric crypto request. */

 * Dispatch an asymmetric crypto request.
 */
static int
crypto_kinvoke(struct cryptkop *krp)
{
	struct cryptocap *cap = NULL;
	int error;

	KASSERT(krp != NULL, ("%s: krp == NULL", __func__));
	KASSERT(krp->krp_callback != NULL,
	    ("%s: krp->crp_callback == NULL", __func__));

	CRYPTO_DRIVER_LOCK();
	cap = crypto_lookup_kdriver(krp);
	if (cap == NULL) {
		CRYPTO_DRIVER_UNLOCK();
		krp->krp_status = ENODEV;
		crypto_kdone(krp);
		return (0);
	}

	/*
	 * If the device is blocked, return ERESTART to requeue it.
	 */
	if (cap->cc_kqblocked) {
		/*
		 * XXX: Previously this set krp_status to ERESTART and
		 * invoked crypto_kdone but the caller would still
		 * requeue it.
		 */
		CRYPTO_DRIVER_UNLOCK();
		return (ERESTART);
	}

	cap->cc_koperations++;
	CRYPTO_DRIVER_UNLOCK();
	error = CRYPTODEV_KPROCESS(cap->cc_dev, krp, 0);
	if (error == ERESTART) {
		CRYPTO_DRIVER_LOCK();
		cap->cc_koperations--;
		CRYPTO_DRIVER_UNLOCK();
		return (error);
	}

	KASSERT(error == 0, ("error %d returned from crypto_kprocess", error));
	return (0);
}

static void
crypto_task_invoke(void *ctx, int pending)