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authorVitaly Kuznetsov <vkuznets@redhat.com>2015-04-22 21:31:29 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-05-24 12:18:23 -0700
commit096c605feb3d85b309e95db2afc01584b967cc23 (patch)
tree629d155ca8d1d94daff6a26eddedd8ecbca1aee5 /drivers/hv
parente4ecb41cf96f4468202498593cc08e3e9dd3df58 (diff)
downloadop-kernel-dev-096c605feb3d85b309e95db2afc01584b967cc23.zip
op-kernel-dev-096c605feb3d85b309e95db2afc01584b967cc23.tar.gz
Drivers: hv: vmbus: unregister panic notifier on module unload
Commit 96c1d0581d00f7abe033350edb021a9d947d8d81 ("Drivers: hv: vmbus: Add support for VMBus panic notifier handler") introduced atomic_notifier_chain_register() call on module load. We also need to call atomic_notifier_chain_unregister() on module unload as otherwise the following crash is observed when we bring hv_vmbus back: [ 39.788877] BUG: unable to handle kernel paging request at ffffffffa00078a8 [ 39.788877] IP: [<ffffffff8109d63f>] notifier_call_chain+0x3f/0x80 ... [ 39.788877] Call Trace: [ 39.788877] [<ffffffff8109de7d>] __atomic_notifier_call_chain+0x5d/0x90 ... [ 39.788877] [<ffffffff8109d788>] ? atomic_notifier_chain_register+0x38/0x70 [ 39.788877] [<ffffffff8109d767>] ? atomic_notifier_chain_register+0x17/0x70 [ 39.788877] [<ffffffffa002814f>] hv_acpi_init+0x14f/0x1000 [hv_vmbus] [ 39.788877] [<ffffffff81002144>] do_one_initcall+0xd4/0x210 Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/vmbus_drv.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 0d8d1d7..7870a90 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1108,6 +1108,10 @@ static void __exit vmbus_exit(void)
hv_synic_clockevents_cleanup();
hv_remove_vmbus_irq();
vmbus_free_channels();
+ if (ms_hyperv.features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
+ atomic_notifier_chain_unregister(&panic_notifier_list,
+ &hyperv_panic_block);
+ }
bus_unregister(&hv_bus);
hv_cleanup();
for_each_online_cpu(cpu)
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