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Commit c0048de2 authored by Hendrik Brueckner's avatar Hendrik Brueckner Committed by Martin Schwidefsky
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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: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 0e0d04a8

net/iucv/iucv.c

+4 −1
Original line number Diff line number Diff line
@@ -831,8 +831,11 @@ static int iucv_reboot_event(struct notifier_block *this, 
{

	int i;



	if (cpumask_empty(&iucv_irq_cpumask))

		return NOTIFY_DONE;



	get_online_cpus();

	on_each_cpu(iucv_block_cpu, NULL, 1);

	on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);

	preempt_disable();

	for (i = 0; i < iucv_max_pathid; i++) {

		if (iucv_path_table[i])