[S390] cio: Disable channel measurements (cmf) on shutdown/reboot.

Disable channel measurements for all ccw devices via the ccw bus's
shutdown method. Clear residual cmf related information that may be
in the schib when setting up a new subchannel.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/cio.c

@@ -619,6 +619,11 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
 	sch->schib.pmcw.ena = 0;
 	if ((sch->lpm & (sch->lpm - 1)) != 0)
 		sch->schib.pmcw.mp = 1;	/* multipath mode */
+	/* clean up possible residual cmf stuff */
+	sch->schib.pmcw.mme = 0;
+	sch->schib.pmcw.mbfc = 0;
+	sch->schib.pmcw.mbi = 0;
+	sch->schib.mba = 0;
 	return 0;
 out:
 	if (!cio_is_console(schid))

drivers/s390/cio/device.c

@@ -21,6 +21,7 @@
 #include <asm/ccwdev.h>
 #include <asm/cio.h>
 #include <asm/param.h>		/* HZ */
+#include <asm/cmb.h>
 
 #include "cio.h"
 #include "cio_debug.h"
@@ -1440,6 +1441,7 @@ static void ccw_device_shutdown(struct device *dev)
 	cdev = to_ccwdev(dev);
 	if (cdev->drv && cdev->drv->shutdown)
 		cdev->drv->shutdown(cdev);
+	disable_cmf(cdev);
 }
 
 struct bus_type ccw_bus_type = {