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Commit 51cbe7e7 authored by Borislav Petkov's avatar Borislav Petkov
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x86, MCE: Robustify mcheck_init_device



BorisO reports that misc_register() fails often on xen. The current code
unregisters the CPU hotplug notifier in that case. If then a CPU is
offlined and onlined back again, we end up with a second timer running
on that CPU, leading to soft lockups and system hangs.

So let's leave the hotcpu notifier always registered - even if
mce_device_create failed for some cores and never unreg it so that we
can deal with the timer handling accordingly.

Reported-and-Tested-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Link: http://lkml.kernel.org/r/1403274493-1371-1-git-send-email-boris.ostrovsky@oracle.com


Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
parent 9a3c4145
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