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| author | Silas Boyd-Wickizer <sbw@mit.edu> | 2012-09-23 20:27:32 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@endymion.delvare> | 2012-09-23 20:27:32 +0200 |
| commit | 1ec3ddfd27a77db55b8c0e80bcd27c656473fb96 (patch) | |
| tree | a23e97b565f6618f008244da29cea7a4e1a4b239 /drivers/hwmon/adm1031.c | |
| parent | Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus (diff) | |
| download | linux-1ec3ddfd27a77db55b8c0e80bcd27c656473fb96.tar.xz linux-1ec3ddfd27a77db55b8c0e80bcd27c656473fb96.zip | |
hwmon: (via-cputemp) Use get_online_cpus to avoid races involving CPU hotplug
via_cputemp_init loops with for_each_online_cpu, adding
platform_devices, then calls register_hotcpu_notifier. If a CPU is
offlined between the loop and register_hotcpu_notifier, then later
onlined, via_cputemp_device_add will attempt to add platform devices
with the same ID. A similar race occurs during via_cputemp_exit,
after the module calls unregister_hotcpu_notifier, a CPU might offline
and a device will exist for a CPU that is offline.
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>
Acked-by: Harald Welte <laforge@gnumonks.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/hwmon/adm1031.c')
0 files changed, 0 insertions, 0 deletions