4.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> commit abb6627910a1e783c8e034b35b7c80e5e7f98f41 upstream. Commit d352cf47d93e (cpufreq: conservative: Do not use transition notifications) overlooked the case when the "frequency step" used by the conservative governor is small relative to the distances between the available frequencies and broke the algorithm by using policy->cur instead of the previously requested frequency when computing the next one. As a result, the governor may not be able to go outside of a narrow range between two consecutive available frequencies. Fix the problem by making the governor save the previously requested frequency and select the next one relative that value (unless it is out of range, in which case policy->cur will be used instead). Fixes: d352cf47d93e (cpufreq: conservative: Do not use transition notifications) Link: https://bugzilla.kernel.org/show_bug.cgi?id=177171 Reported-and-tested-by: Aleksey Rybalkin <aleksey@xxxxxxxxxxxx> Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/cpufreq/cpufreq_conservative.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -17,6 +17,7 @@ struct cs_policy_dbs_info { struct policy_dbs_info policy_dbs; unsigned int down_skip; + unsigned int requested_freq; }; static inline struct cs_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs) @@ -61,6 +62,7 @@ static unsigned int cs_dbs_timer(struct { struct policy_dbs_info *policy_dbs = policy->governor_data; struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); + unsigned int requested_freq = dbs_info->requested_freq; struct dbs_data *dbs_data = policy_dbs->dbs_data; struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; unsigned int load = dbs_update(policy); @@ -72,10 +74,16 @@ static unsigned int cs_dbs_timer(struct if (cs_tuners->freq_step == 0) goto out; + /* + * If requested_freq is out of range, it is likely that the limits + * changed in the meantime, so fall back to current frequency in that + * case. + */ + if (requested_freq > policy->max || requested_freq < policy->min) + requested_freq = policy->cur; + /* Check for frequency increase */ if (load > dbs_data->up_threshold) { - unsigned int requested_freq = policy->cur; - dbs_info->down_skip = 0; /* if we are already at full speed then break out early */ @@ -83,8 +91,11 @@ static unsigned int cs_dbs_timer(struct goto out; requested_freq += get_freq_target(cs_tuners, policy); + if (requested_freq > policy->max) + requested_freq = policy->max; __cpufreq_driver_target(policy, requested_freq, CPUFREQ_RELATION_H); + dbs_info->requested_freq = requested_freq; goto out; } @@ -95,7 +106,7 @@ static unsigned int cs_dbs_timer(struct /* Check for frequency decrease */ if (load < cs_tuners->down_threshold) { - unsigned int freq_target, requested_freq = policy->cur; + unsigned int freq_target; /* * if we cannot reduce the frequency anymore, break out early */ @@ -109,6 +120,7 @@ static unsigned int cs_dbs_timer(struct requested_freq = policy->min; __cpufreq_driver_target(policy, requested_freq, CPUFREQ_RELATION_L); + dbs_info->requested_freq = requested_freq; } out: @@ -287,6 +299,7 @@ static void cs_start(struct cpufreq_poli struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); dbs_info->down_skip = 0; + dbs_info->requested_freq = policy->cur; } static struct dbs_governor cs_governor = { -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html