linux-kernel - [PATCH] cpufreq: cached_resolved

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Message-Id: <d48d824ab3abacb2356878780979d7ed42191eaf.1596080365.git.viresh.kumar@linaro.org>
Date:   Thu, 30 Jul 2020 09:38:15 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rafael Wysocki <rjw@...ysocki.net>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        ionela.voinescu@....com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] cpufreq: cached_resolved_idx can not be negative

It is not possible for cached_resolved_idx to be invalid here as the
cpufreq core always sets index to a positive value.

Change its type to unsigned int and fix qcom usage a bit.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/cpufreq/qcom-cpufreq-hw.c | 5 +----
 include/linux/cpufreq.h           | 2 +-
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index 0a04b6f03b9a..8c0842bd6c5a 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -66,13 +66,10 @@ static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
 						unsigned int target_freq)
 {
 	void __iomem *perf_state_reg = policy->driver_data;
-	int index;
+	unsigned int index;
 	unsigned long freq;
 
 	index = policy->cached_resolved_idx;
-	if (index < 0)
-		return 0;
-
 	writel_relaxed(index, perf_state_reg);
 
 	freq = policy->freq_table[index].frequency;
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index e62b022cb07e..58687a5bf9c8 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -127,7 +127,7 @@ struct cpufreq_policy {
 
 	 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
 	unsigned int cached_target_freq;
-	int cached_resolved_idx;
+	unsigned int cached_resolved_idx;
 
 	/* Synchronization for frequency transitions */
 	bool			transition_ongoing; /* Tracks transition status */
-- 
2.14.1