[S390] cio: Trigger verification on device/path not operational.

Currently, we don't do much on no path or no device situations during
normal user I/O, since we rely on reports regarding those events by
the machine. If we trigger a path verification to bring our device
state up-to-date, we (a) may recover from path failures earlier and
(b) better handle situations where the hardware/hypervisor doesn't
give us enough notifications.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

drivers/s390/cio/device_ops.c

@@ -193,8 +193,15 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
 			return -EACCES;
 	}
 	ret = cio_start_key (sch, cpa, lpm, key);
-	if (ret == 0)
+	switch (ret) {
+	case 0:
 		cdev->private->intparm = intparm;
+		break;
+	case -EACCES:
+	case -ENODEV:
+		dev_fsm_event(cdev, DEV_EVENT_VERIFY);
+		break;
+	}
 	return ret;
 }
 

drivers/s390/cio/device_status.c

@@ -312,6 +312,7 @@ ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
 {
 	struct subchannel *sch;
 	struct ccw1 *sense_ccw;
+	int rc;
 
 	sch = to_subchannel(cdev->dev.parent);
 
@@ -337,7 +338,10 @@ ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
 	/* Reset internal retry indication. */
 	cdev->private->flags.intretry = 0;
 
-	return cio_start(sch, sense_ccw, 0xff);
+	rc = cio_start(sch, sense_ccw, 0xff);
+	if (rc == -ENODEV || rc == -EACCES)
+		dev_fsm_event(cdev, DEV_EVENT_VERIFY);
+	return rc;
 }
 
 /*