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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2009-10-29 15:04:13 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2009-10-29 15:05:13 +0100 |
| commit | f8501ba77d69c88a65e4ebbe03bdc65b1edb0b86 (patch) | |
| tree | 27e42cf7bd5171c5b17c2d423b6ae5d3394cb6ef | |
| parent | 70f5dc514c0b183ee813dc3b3983b04891fd1e7a (diff) | |
| download | linux-stable-f8501ba77d69c88a65e4ebbe03bdc65b1edb0b86.tar.gz linux-stable-f8501ba77d69c88a65e4ebbe03bdc65b1edb0b86.tar.bz2 linux-stable-f8501ba77d69c88a65e4ebbe03bdc65b1edb0b86.zip | |
[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: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | arch/s390/kernel/ipl.c | 7 | ||||
| -rw-r--r-- | arch/s390/kernel/smp.c | 4 | ||||
| -rw-r--r-- | arch/s390/kernel/swsusp_asm64.S | 1 |
3 files changed, 6 insertions, 6 deletions
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index ee57a42e6e93..4890ac6d7faa 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -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, diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index c699ac538c49..c99c45b848e3 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -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 (;;); } diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S index 7c8653e27db6..0f4ef3b856d9 100644 --- a/arch/s390/kernel/swsusp_asm64.S +++ b/arch/s390/kernel/swsusp_asm64.S @@ -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: |