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[S390] sclp: undo quiesce handler override on resume 

In a system where the ctrl-alt-del init action initiated by signal
quiesce suspends the machine the quiesce handler override for
_machine_restart, _machine_halt and _machine_power_off needs to be
undone, otherwise the override is still present in the resumed
system. The next shutdown would then load the quiesce state psw
instead of performing the correct shutdown action.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2009-11-13 15:43:53 +01:00 committed by Martin Schwidefsky
parent b89031e087
commit 8b94c1ed4d
1 changed files with 38 additions and 10 deletions
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48
drivers/s390/char/sclp_quiesce.c
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@ -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);
}