s390/cio: remove pm support from chsc subchannel driver

As part of removing the broken pm-support from s390 arch, remove
the pm-calls from chsc subchannel driver. The power-management
functions are unused since the 'commit 39421627 ("s390: remove
broken hibernate / power management support")'.
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

drivers/s390/cio/chsc_sch.c

@@ -120,31 +120,6 @@ static void chsc_subchannel_shutdown(struct subchannel *sch)
 	cio_disable_subchannel(sch);
 }
 
-static int chsc_subchannel_prepare(struct subchannel *sch)
-{
-	int cc;
-	struct schib schib;
-	/*
-	 * Don't allow suspend while the subchannel is not idle
-	 * since we don't have a way to clear the subchannel and
-	 * cannot disable it with a request running.
-	 */
-	cc = stsch(sch->schid, &schib);
-	if (!cc && scsw_stctl(&schib.scsw))
-		return -EAGAIN;
-	return 0;
-}
-
-static int chsc_subchannel_freeze(struct subchannel *sch)
-{
-	return cio_disable_subchannel(sch);
-}
-
-static int chsc_subchannel_restore(struct subchannel *sch)
-{
-	return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
-}
-
 static struct css_device_id chsc_subchannel_ids[] = {
 	{ .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
 	{ /* end of list */ },
@@ -161,10 +136,6 @@ static struct css_driver chsc_subchannel_driver = {
 	.probe = chsc_subchannel_probe,
 	.remove = chsc_subchannel_remove,
 	.shutdown = chsc_subchannel_shutdown,
-	.prepare = chsc_subchannel_prepare,
-	.freeze = chsc_subchannel_freeze,
-	.thaw = chsc_subchannel_restore,
-	.restore = chsc_subchannel_restore,
 };
 
 static int __init chsc_init_dbfs(void)