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authorHendrik Brueckner <brueckner@linux.vnet.ibm.com>2013-02-06 19:12:03 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-02-14 18:55:19 +0400
commitc0048de29d207fe3407360c28a9025891506dd6a (patch)
treeaa6684b2e790103c7f26654ed638b91d31b4aace /net/iucv
parent0e0d04a8677f33360cfbb5f8c7aa4ee8cbf5a287 (diff)
downloadlinux-c0048de29d207fe3407360c28a9025891506dd6a.tar.xz
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>
Diffstat (limited to 'net/iucv')
-rw-r--r--net/iucv/iucv.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
index df082508362d..4fe76ff214c2 100644
--- a/net/iucv/iucv.c
+++ b/net/iucv/iucv.c
@@ -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])