From: Cornelia Huck <[email protected]>
Signed-off-by: Cornelia Huck <[email protected]>
Signed-off-by: Sebastian Ott <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
---
drivers/s390/cio/chsc_sch.c | 32 +++++++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)
Index: linux-2.6/drivers/s390/cio/chsc_sch.c
===================================================================
--- linux-2.6.orig/drivers/s390/cio/chsc_sch.c
+++ linux-2.6/drivers/s390/cio/chsc_sch.c
@@ -1,7 +1,8 @@
/*
* Driver for s390 chsc subchannels
*
- * Copyright IBM Corp. 2008
+ * Copyright IBM Corp. 2008, 2009
+ *
* Author(s): Cornelia Huck <[email protected]>
*
*/
@@ -112,6 +113,31 @@ static void chsc_subchannel_shutdown(str
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 */ },
@@ -125,6 +151,10 @@ static struct css_driver chsc_subchannel
.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,
.name = "chsc_subchannel",
};
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.