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

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>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 2677ff1c0a2c..24cd6ff9bb0b 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -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);