s390/zcryt: Handle AP configuration changes

Detect external AP bus configuration changes and request
an AP device rescan.

Signed-off-by: Holger Dengler <hd@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 39e5eb263e4b..cf5d9dc51c94 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -950,6 +950,20 @@ void ap_driver_unregister(struct ap_driver *ap_drv)
 }
 EXPORT_SYMBOL(ap_driver_unregister);
 
+void ap_bus_force_rescan(void)
+{
+        /* Delete the AP bus rescan timer. */
+        del_timer(&ap_config_timer);
+
+        /* processing a synchonuous bus rescan */
+        ap_scan_bus(NULL);
+
+        /* Setup the AP bus rescan timer again. */
+        ap_config_timer.expires = jiffies + ap_config_time * HZ;
+        add_timer(&ap_config_timer);
+}
+EXPORT_SYMBOL(ap_bus_force_rescan);
+
 /*
  * AP bus attributes.
  */