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| author | Viresh Kumar <viresh.kumar@linaro.org> | 2013-06-19 10:16:55 +0530 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2014-05-15 07:28:19 +0200 |
| commit | bcb417719f20d732f54fc87c99d05b8f246ef889 (patch) | |
| tree | 2a7fa5740573bb4d7d53b41b0ecf16587858e21a /include | |
| parent | 45b5bbeed46077b367057075ae607f1e7034402b (diff) | |
| download | linux-3.10-bcb417719f20d732f54fc87c99d05b8f246ef889.tar.gz linux-3.10-bcb417719f20d732f54fc87c99d05b8f246ef889.tar.bz2 linux-3.10-bcb417719f20d732f54fc87c99d05b8f246ef889.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.
Change-Id: I0f5465bd515c431ae2d3711d065f70aacec7e978
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include')
| -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 9791c329c3e..e3da73bbcf0 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -121,6 +121,7 @@ struct cpufreq_policy { struct list_head policy_list; struct kobject kobj; struct completion kobj_unregister; + bool transition_ongoing; /* Tracks transition status */ }; #define CPUFREQ_ADJUST (0) |