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Commit 8d451690 authored by Thomas Gleixner's avatar Thomas Gleixner
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watchdog: Fix CPU hotplug regression



Norbert reported:
"3.7-rc6 booted with nmi_watchdog=0 fails to suspend to RAM or
 offline CPUs. It's reproducable with a KVM guest and physical
 system."

The reason is that commit bcd951cf(watchdog: Use hotplug thread
infrastructure) missed to take this into account. So the cpu offline
code gets stuck in the teardown function because it accesses non
initialized data structures.

Add a check for watchdog_enabled into that path to cure the issue.

Reported-and-tested-by: default avatarNorbert Warmuth <nwarmuth@t-online.de>
Tested-by: default avatarJoseph Salisbury <joseph.salisbury@canonical.com>
Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1211231033230.2701@ionos
Link: http://bugs.launchpad.net/bugs/1079534


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent b69f0859
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