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Commit f8501ba7 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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[S390] smp: fix sigp stop handling 



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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 70f5dc51

arch/s390/kernel/ipl.c

+3 −4
Original line number Diff line number Diff line
@@ -1595,11 +1595,10 @@ 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);

	while (signal_processor(smp_processor_id(), sigp_stop) == sigp_busy)

		cpu_relax();

	for (;;);

}

}



static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,

					     stop_run, NULL};

arch/s390/kernel/smp.c

+2 −2
Original line number Diff line number Diff line
@@ -647,8 +647,8 @@ void __cpu_die(unsigned int cpu) 
void cpu_die(void)

{

	idle_task_exit();

	signal_processor(smp_processor_id(), sigp_stop);

	BUG();

	while (signal_processor(smp_processor_id(), sigp_stop) == sigp_busy)

		cpu_relax();

	for (;;);

}

arch/s390/kernel/swsusp_asm64.S

+1 −0
Original line number Diff line number Diff line
@@ -199,6 +199,7 @@ pgm_check_entry: 
	brc	2,4b			/* busy, try again */

5:

	sigp	%r9,%r2,__SIGP_STOP	/* stop resume (current) CPU */

	brc	2,5b			/* busy, try again */

6:	j	6b



restart_suspend: