[S390] cio: Use path verification for last path gone after vary off.
If the last path to a device is gone after a chpid has been varied
off, putting it on the slow queue doesn't prevent a device driver
from still attempting to use it (it may stay on the slow queue for a
long time). Instead, trigger a verify event which will prevent I/O
attempts from the device driver immediately.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
index 4c2ff83..da73453 100644
--- a/drivers/s390/cio/css.h
+++ b/drivers/s390/cio/css.h
@@ -171,6 +171,7 @@
/* Helper functions for vary on/off. */
int device_is_online(struct subchannel *);
void device_kill_io(struct subchannel *);
+int device_trigger_verify(struct subchannel *sch);
/* Machine check helper function. */
void device_kill_pending_timer(struct subchannel *);