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iucv: fix kernel panic at reboot

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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>
This commit is contained in:
Hendrik Brueckner 2013-02-06 16:12:03 +01:00 committed by Martin Schwidefsky
parent 0e0d04a867
commit c0048de29d
1 changed files with 4 additions and 1 deletions
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5
net/iucv/iucv.c
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@ -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])