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| author | Viresh Kumar <viresh.kumar@linaro.org> | 2013-06-19 10:16:55 +0530 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-06-27 21:49:55 +0200 |
| commit | 7c30ed532cf798a8d924562f2f44d03d7652f7a7 (patch) | |
| tree | 6198099d8f7fc69c3510908d539df878857684cd /include/linux/cpufreq.h | |
| parent | e11158c0c9ab59d46bb70953f6275643a7a01fa1 (diff) | |
| download | linux-7c30ed532cf798a8d924562f2f44d03d7652f7a7.tar.gz linux-7c30ed532cf798a8d924562f2f44d03d7652f7a7.tar.bz2 linux-7c30ed532cf798a8d924562f2f44d03d7652f7a7.zip | |
cpufreq: make sure frequency transitions are serialized
Whenever we are changing frequency of a cpu, we are calling PRECHANGE and
POSTCHANGE notifiers. They must be serialized. i.e. PRECHANGE or POSTCHANGE
shouldn't be called twice contiguously.
This can happen due to bugs in users of __cpufreq_driver_target() or actual
cpufreq drivers who are sending these notifiers.
This patch adds some protection against this. Now, we keep track of the last
transaction and see if something went wrong.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/cpufreq.h')
| -rw-r--r-- | include/linux/cpufreq.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 3c7ee2f90370..c0bc7374445e 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -119,6 +119,7 @@ struct cpufreq_policy { struct kobject kobj; struct completion kobj_unregister; + bool transition_ongoing; /* Tracks transition status */ }; #define CPUFREQ_ADJUST (0) |