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path: root/drivers/s390/char/sclp_quiesce.c
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Diffstat (limited to 'drivers/s390/char/sclp_quiesce.c')
-rw-r--r--drivers/s390/char/sclp_quiesce.c48
1 files changed, 38 insertions, 10 deletions
diff --git a/drivers/s390/char/sclp_quiesce.c b/drivers/s390/char/sclp_quiesce.c
index 84c191c1cd62..05909a7df8b3 100644
--- a/drivers/s390/char/sclp_quiesce.c
+++ b/drivers/s390/char/sclp_quiesce.c
@@ -20,9 +20,12 @@
#include "sclp.h"
+static void (*old_machine_restart)(char *);
+static void (*old_machine_halt)(void);
+static void (*old_machine_power_off)(void);
+
/* Shutdown handler. Signal completion of shutdown by loading special PSW. */
-static void
-do_machine_quiesce(void)
+static void do_machine_quiesce(void)
{
psw_t quiesce_psw;
@@ -33,23 +36,48 @@ do_machine_quiesce(void)
}
/* Handler for quiesce event. Start shutdown procedure. */
-static void
-sclp_quiesce_handler(struct evbuf_header *evbuf)
+static void sclp_quiesce_handler(struct evbuf_header *evbuf)
{
- _machine_restart = (void *) do_machine_quiesce;
- _machine_halt = do_machine_quiesce;
- _machine_power_off = do_machine_quiesce;
+ if (_machine_restart != (void *) do_machine_quiesce) {
+ old_machine_restart = _machine_restart;
+ old_machine_halt = _machine_halt;
+ old_machine_power_off = _machine_power_off;
+ _machine_restart = (void *) do_machine_quiesce;
+ _machine_halt = do_machine_quiesce;
+ _machine_power_off = do_machine_quiesce;
+ }
ctrl_alt_del();
}
+/* Undo machine restart/halt/power_off modification on resume */
+static void sclp_quiesce_pm_event(struct sclp_register *reg,
+ enum sclp_pm_event sclp_pm_event)
+{
+ switch (sclp_pm_event) {
+ case SCLP_PM_EVENT_RESTORE:
+ if (old_machine_restart) {
+ _machine_restart = old_machine_restart;
+ _machine_halt = old_machine_halt;
+ _machine_power_off = old_machine_power_off;
+ old_machine_restart = NULL;
+ old_machine_halt = NULL;
+ old_machine_power_off = NULL;
+ }
+ break;
+ case SCLP_PM_EVENT_FREEZE:
+ case SCLP_PM_EVENT_THAW:
+ break;
+ }
+}
+
static struct sclp_register sclp_quiesce_event = {
.receive_mask = EVTYP_SIGQUIESCE_MASK,
- .receiver_fn = sclp_quiesce_handler
+ .receiver_fn = sclp_quiesce_handler,
+ .pm_event_fn = sclp_quiesce_pm_event
};
/* Initialize quiesce driver. */
-static int __init
-sclp_quiesce_init(void)
+static int __init sclp_quiesce_init(void)
{
return sclp_register(&sclp_quiesce_event);
}