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cpufreq: Do not allow ->setpolicy drivers to provide ->target

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cpufreq drivers that provide the ->setpolicy() callback are supposed
to have integrated governors, so they don't need to set ->target()
or ->target_index() and may confuse the core if any of these callbacks
is present.

For this reason, add a check preventing ->setpolicy cpufreq drivers
from registering if they have non-NULL ->target or ->target_index.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2014-03-19 12:48:30 +01:00
parent 8f3ba3d325
commit 9832235f3f
1 changed files with 3 additions and 1 deletions
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4
drivers/cpufreq/cpufreq.c
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@ -2299,7 +2299,9 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
if (!driver_data || !driver_data->verify || !driver_data->init ||
!(driver_data->setpolicy || driver_data->target_index ||
driver_data->target))
driver_data->target) ||
(driver_data->setpolicy && (driver_data->target_index ||
driver_data->target)))
return -EINVAL;
pr_debug("trying to register driver %s\n", driver_data->name);