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[S390] smp: fix sigp stop handling

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According to the architecture a cpu must not necessarily enter stopped
state after completion of a sigp instruction with "stop" order code.
So remove the BUG() statement after self sending sigp stop to avoid
that it ever gets reached.
Also add a sigp busy check to make sure that the order gets delivered.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2009-10-29 15:04:13 +01:00
committed by Martin Schwidefsky
parent 70f5dc514c
commit f8501ba77d
3 changed files with 6 additions and 6 deletions
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7
arch/s390/kernel/ipl.c
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@@ -1595,10 +1595,9 @@ static void stop_run(struct shutdown_trigger *trigger)
{
if (strcmp(trigger->name, ON_PANIC_STR) == 0)
disabled_wait((unsigned long) __builtin_return_address(0));
else {
signal_processor(smp_processor_id(), sigp_stop);
for (;;);
}
while (signal_processor(smp_processor_id(), sigp_stop) == sigp_busy)
cpu_relax();
for (;;);
}
static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,