cpufreq: governor: Ensure sufficiently large sampling intervals

After commit aa7519af450d (cpufreq: Use transition_delay_us for legacy
governors as well) the sampling_rate field of struct dbs_data may be
less than the tick period which causes dbs_update() to produce
incorrect results, so make the code ensure that the value of that
field will always be sufficiently large.

Fixes: aa7519af450d (cpufreq: Use transition_delay_us for legacy governors as well)
Reported-by: Andy Tang <andy.tang@nxp.com>
Reported-by: Doug Smythies <dsmythies@telus.net>
Tested-by: Andy Tang <andy.tang@nxp.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 58d4f4e1ad6a907991873a03027e6c7aa2f31fc4..ca38229b045ab288a2f250dddaf1b174e8c0572f 100644 (file)
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -22,6 +22,8 @@
 
 #include "cpufreq_governor.h"
 
+#define CPUFREQ_DBS_MIN_SAMPLING_INTERVAL      (2 * TICK_NSEC / NSEC_PER_USEC)
+
 static DEFINE_PER_CPU(struct cpu_dbs_info, cpu_dbs);
 
 static DEFINE_MUTEX(gov_dbs_data_mutex);
@@ -47,11 +49,15 @@ ssize_t store_sampling_rate(struct gov_attr_set *attr_set, const char *buf,
 {
        struct dbs_data *dbs_data = to_dbs_data(attr_set);
        struct policy_dbs_info *policy_dbs;
+       unsigned int sampling_interval;
        int ret;
-       ret = sscanf(buf, "%u", &dbs_data->sampling_rate);
-       if (ret != 1)
+
+       ret = sscanf(buf, "%u", &sampling_interval);
+       if (ret != 1 || sampling_interval < CPUFREQ_DBS_MIN_SAMPLING_INTERVAL)
                return -EINVAL;
 
+       dbs_data->sampling_rate = sampling_interval;
+
        /*
         * We are operating under dbs_data->mutex and so the list and its
         * entries can't be freed concurrently.
@@ -430,7 +436,14 @@ int cpufreq_dbs_governor_init(struct cpufreq_policy *policy)
        if (ret)
                goto free_policy_dbs_info;
 
-       dbs_data->sampling_rate = cpufreq_policy_transition_delay_us(policy);
+       /*
+        * The sampling interval should not be less than the transition latency
+        * of the CPU and it also cannot be too small for dbs_update() to work
+        * correctly.
+        */
+       dbs_data->sampling_rate = max_t(unsigned int,
+                                       CPUFREQ_DBS_MIN_SAMPLING_INTERVAL,
+                                       cpufreq_policy_transition_delay_us(policy));
 
        if (!have_governor_per_policy())
                gov->gdbs_data = dbs_data;