cpufreq: Return error if ->get() failed in cpufreq_update_policy()

cpufreq_update_policy() calls cpufreq_driver->get() to get current
frequency of a CPU and it is not supposed to fail or return zero.
Return error in case that happens.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 5815af50d3de..56b7b1be352d 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2139,6 +2139,11 @@ int cpufreq_update_policy(unsigned int cpu)
          */
         if (cpufreq_driver->get) {
                 new_policy.cur = cpufreq_driver->get(cpu);
+                if (WARN_ON(!new_policy.cur)) {
+                        ret = -EIO;
+                        goto no_policy;
+                }
+
                 if (!policy->cur) {
                         pr_debug("Driver did not initialize current freq");
                         policy->cur = new_policy.cur;