[S390] etr/stp: fix possible deadlock
Precreate stop_machine threads in case the machine supports ETR/STP. Otherwise we might deadlock if a time sync operation gets scheduled and the creation of stop_machine threads would cause disk I/O. This is just the minimal fix. The real fix would be to only precreate stop_machine threads if ETR/STP is actually used. But that would be a rather large and complicated patch. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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@ -399,8 +399,10 @@ static struct workqueue_struct *time_sync_wq;
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static void __init time_init_wq(void)
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{
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if (!time_sync_wq)
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time_sync_wq = create_singlethread_workqueue("timesync");
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if (time_sync_wq)
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return;
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time_sync_wq = create_singlethread_workqueue("timesync");
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stop_machine_create();
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}
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/*
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