From: Silas Boyd-Wickizer <sbw@mit.edu>
Date: Sun, 23 Sep 2012 18:27:32 +0000 (+0200)
Subject: hwmon: (coretemp) Use get_online_cpus to avoid races involving CPU hotplug
X-Git-Tag: v3.6-rc7~2^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=641f14560035bbb86500ea4b3a27ad27f034725b;p=pandora-kernel.git

hwmon: (coretemp) Use get_online_cpus to avoid races involving CPU hotplug

coretemp_init loops with for_each_online_cpu, adding platform_devices
and sysfs interfaces, then calls register_hotcpu_notifier.  There is a
race if a CPU is offlined or onlined after the loop, but before
register_hotcpu_notifier.  The race might result in the absence of a
platform_device+sysfs interface for an online CPU, or the presence of
a platform_device+sysfs interface for an offline CPU.  A similar race
occurs during coretemp_exit, after the module calls
unregister_hotcpu_notifier, but before it unregisters all devices, a
CPU might offline and a device for an offline CPU will exist for a
short while.

This fix surrounds for_each_online_cpu and register_hotcpu_notifier
with get_online_cpus+put_online_cpus; and surrounds
unregister_hotcpu_notifier and device unregistering with
get_online_cpus+put_online_cpus.

Build tested.

Signed-off-by: Silas Boyd-Wickizer <sbw@mit.edu>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
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