[PATCH] cpufreq/intel_pstate: Set timer timeout correctly

[dirk . brandewie]

From: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>

The current calculation of the delay time is wrong and a cut and paste
error from a previous experimental driver.  This can result in the
timeout being set to jiffies + 1 which setup the driver to race with
it's self if the apic timer interrupt happen at just the right time.


https://bugzilla.redhat.com/show_bug.cgi?id=920289

Reported-by: Adam Williamson <awilliam@xxxxxxxxxx>
Reported-by: Parag Warudkar <parag.lkml@xxxxxxxxx>

Signed-off-by: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
---
 drivers/cpufreq/intel_pstate.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 43ffe1c..4d6b988 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -502,7 +502,6 @@ static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
 
 	sample_time = cpu->pstate_policy->sample_rate_ms;
 	delay = msecs_to_jiffies(sample_time);
-	delay -= jiffies % delay;
 	mod_timer_pinned(&cpu->timer, jiffies + delay);
 }
 
-- 
1.7.7.6

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