Commit c40284b3 authored by Harald Freudenberger's avatar Harald Freudenberger Committed by Vasily Gorbik
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s390/ap: re-enable interrupt for AP queues 



This patch introduces some code lines which check
for interrupt support enabled on an AP queue after
a reply has been received. This invocation has been
chosen as there is a good chance to have the queue
empty at that time. As the enablement of the irq
imples a state machine change the queue should not
have any pending requests or unreceived replies.

Reviewed-by: default avatarTony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: default avatarHolger Dengler <dengler@linux.ibm.com>
Signed-off-by: default avatarHarald Freudenberger <freude@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent 01c89ab7

drivers/s390/crypto/ap_queue.c

+12 −2
Original line number Diff line number Diff line
@@ -200,13 +200,13 @@ static enum ap_sm_wait ap_sm_read(struct ap_queue *aq) 
			return AP_SM_WAIT_AGAIN;

		}

		aq->sm_state = AP_SM_STATE_IDLE;

		return AP_SM_WAIT_NONE;

		break;

	case AP_RESPONSE_NO_PENDING_REPLY:

		if (aq->queue_count > 0)

			return status.irq_enabled ?

				AP_SM_WAIT_INTERRUPT : AP_SM_WAIT_HIGH_TIMEOUT;

		aq->sm_state = AP_SM_STATE_IDLE;

		return AP_SM_WAIT_NONE;

		break;

	default:

		aq->dev_state = AP_DEV_STATE_ERROR;

		aq->last_err_rc = status.response_code;
@@ -215,6 +215,16 @@ static enum ap_sm_wait ap_sm_read(struct ap_queue *aq) 
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));

		return AP_SM_WAIT_NONE;

	}

	/* Check and maybe enable irq support (again) on this queue */

	if (!status.irq_enabled && status.queue_empty) {

		void *lsi_ptr = ap_airq_ptr();



		if (lsi_ptr && ap_queue_enable_irq(aq, lsi_ptr) == 0) {

			aq->sm_state = AP_SM_STATE_SETIRQ_WAIT;

			return AP_SM_WAIT_AGAIN;

		}

	}

	return AP_SM_WAIT_NONE;

}



/**