iucv: fix kernel panic at reboot
The iucv base layer is initialized during the registration of the first iucv handler. If no handler is registered and the iucv_reboot_event() notifier is called, a missing check can cause a kernel panic in iucv_block_cpu(). To solve this issue, check the IRQ masks invoke iucv_block_cpu() for enabled CPUs only. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -831,8 +831,11 @@ static int iucv_reboot_event(struct notifier_block *this,
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{
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int i;
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if (cpumask_empty(&iucv_irq_cpumask))
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return NOTIFY_DONE;
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get_online_cpus();
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on_each_cpu(iucv_block_cpu, NULL, 1);
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on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
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preempt_disable();
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for (i = 0; i < iucv_max_pathid; i++) {
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if (iucv_path_table[i])
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