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| author | Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | 2013-02-06 16:12:03 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-02-14 15:55:19 +0100 |
| commit | c0048de29d207fe3407360c28a9025891506dd6a (patch) | |
| tree | aa6684b2e790103c7f26654ed638b91d31b4aace /net/iucv/iucv.c | |
| parent | 0e0d04a8677f33360cfbb5f8c7aa4ee8cbf5a287 (diff) | |
| download | linux-c0048de29d207fe3407360c28a9025891506dd6a.tar.gz linux-c0048de29d207fe3407360c28a9025891506dd6a.tar.bz2 linux-c0048de29d207fe3407360c28a9025891506dd6a.zip | |
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/iucv.c')
| -rw-r--r-- | net/iucv/iucv.c | 5 |
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]) |