s390/zcrypt: fixed domain scanning problem (again)

Older machines with more then 16 domains need a special check before
PQAP instructions can be processed. With commit 5bc334bff9a6e189 this
check was reverted by accident. This patch re-establishes the additional
code needed for checking the extended domains for older machines.

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

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index a60fc2f9f4b2..3d7f19fb9a4e 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -1060,9 +1060,13 @@ static inline int ap_test_config_card_id(unsigned int id)
  */
 static inline int ap_test_config_domain(unsigned int domain)
 {
-        if (!ap_configuration)
-                return 1;
-        return ap_test_config(ap_configuration->aqm, domain);
+        if (!ap_configuration)    /* QCI not supported */
+                if (domain < 16)
+                        return 1; /* then domains 0...15 are configured */
+                else
+                        return 0;
+        else
+                return ap_test_config(ap_configuration->aqm, domain);
 }
 
 /*