s390/zcrypt: improve device probing for zcrypt adapter cards

Improve device probing process for zcrypt adapters to
transmit service request during registration process.

Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 69ef4f8cfac8..4038437ff033 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -901,10 +901,15 @@ static int ap_device_probe(struct device *dev)
         int rc;
 
         ap_dev->drv = ap_drv;
+
+        spin_lock_bh(&ap_device_list_lock);
+        list_add(&ap_dev->list, &ap_device_list);
+        spin_unlock_bh(&ap_device_list_lock);
+
         rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
-        if (!rc) {
+        if (rc) {
                 spin_lock_bh(&ap_device_list_lock);
-                list_add(&ap_dev->list, &ap_device_list);
+                list_del_init(&ap_dev->list);
                 spin_unlock_bh(&ap_device_list_lock);
         }
         return rc;