s390/zcrypt: Fix AP queue handling if queue is full

When the AP queue depth of requests was reached additional requests
have been ignored. These request are stuck in the request queue.

The AP queue handling now push the next waiting request into the
queue after fetching a previous serviced and finished reply.

Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 61f768518a34b0e963cd6b569610045a3f65188b..24ec282e15d8ae436e7dab130a4696708e34be9e 100644 (file)
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -599,8 +599,10 @@ static enum ap_wait ap_sm_read(struct ap_device *ap_dev)
        status = ap_sm_recv(ap_dev);
        switch (status.response_code) {
        case AP_RESPONSE_NORMAL:
-               if (ap_dev->queue_count > 0)
+               if (ap_dev->queue_count > 0) {
+                       ap_dev->state = AP_STATE_WORKING;
                        return AP_WAIT_AGAIN;
+               }
                ap_dev->state = AP_STATE_IDLE;
                return AP_WAIT_NONE;
        case AP_RESPONSE_NO_PENDING_REPLY: