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cpufreq: conservative: Allow down_threshold to take values from 1 to 10 

commit b8e11f7d2791bd9320be1c6e772a60b2aa093e45 upstream.

Commit 27ed3cd2eb (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: 27ed3cd2eb (cpufreq: conservative: Fix the logic in frequency decrease checking)
Signed-off-by: Tomasz Wilczyński <twilczynski@naver.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 3.10+ <stable@vger.kernel.org> # 3.10+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Tomasz Wilczyński 2017-06-11 17:28:39 +09:00 committed by syphyr
parent 502f1cee25
commit de7068eb3b
1 changed files with 2 additions and 2 deletions
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4
drivers/cpufreq/cpufreq_conservative.c
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@ -204,8 +204,8 @@ 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;