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Date: Wed, 1 Nov 2017 22:17:25 +0100 From: Willy Tarreau <w@....eu> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, linux@...ck-us.net Cc: Tomasz Wilczyński <twilczynski@...er.com>, "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>, Willy Tarreau <w@....eu> Subject: [PATCH 3.10 025/139] cpufreq: conservative: Allow down_threshold to take values from 1 to 10 From: Tomasz Wilczyński <twilczynski@...er.com> commit b8e11f7d2791bd9320be1c6e772a60b2aa093e45 upstream. Commit 27ed3cd2ebf4 (cpufreq: conservative: Fix the logic in frequency decrease checking) removed the 10 point substraction when comparing the load against down_threshold but did not remove the related limit for the down_threshold value. As a result, down_threshold lower than 11 is not allowed even though values from 1 to 10 do work correctly too. The comment ("cannot be lower than 11 otherwise freq will not fall") also does not apply after removing the substraction. For this reason, allow down_threshold to take any value from 1 to 99 and fix the related comment. Fixes: 27ed3cd2ebf4 (cpufreq: conservative: Fix the logic in frequency decrease checking) Signed-off-by: Tomasz Wilczyński <twilczynski@...er.com> Acked-by: Viresh Kumar <viresh.kumar@...aro.org> Cc: 3.10+ <stable@...r.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Signed-off-by: Willy Tarreau <w@....eu> --- drivers/cpufreq/cpufreq_conservative.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c index f97cb3d..f34e819 100644 --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -212,8 +212,8 @@ static ssize_t store_down_threshold(struct dbs_data *dbs_data, const char *buf, int ret; ret = sscanf(buf, "%u", &input); - /* cannot be lower than 11 otherwise freq will not fall */ - if (ret != 1 || input < 11 || input > 100 || + /* cannot be lower than 1 otherwise freq will not fall */ + if (ret != 1 || input < 1 || input > 100 || input >= cs_tuners->up_threshold) return -EINVAL; -- 2.8.0.rc2.1.gbe9624a
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