[S390] cio async subchannel reprobe.

Changes in the DASD driver require an asynchronous implementation of the
subchannel reprobe loop. This loop was so far only used by the blacklisting
mechanism but is now available to all CCW device drivers.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/include/asm-s390/cio.h b/include/asm-s390/cio.h
index 089cf56..2b16193 100644
--- a/include/asm-s390/cio.h
+++ b/include/asm-s390/cio.h
@@ -276,6 +276,8 @@
 
 extern void clear_all_subchannels(void);
 
+extern void css_schedule_reprobe(void);
+
 #endif
 
 #endif