diff mbox

[V3,2/5] Thermal: fix bug of counting cpu frequencies.

Message ID 1351615741-24134-3-git-send-email-hongbo.zhang@linaro.com (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Hongbo Zhang Oct. 30, 2012, 4:48 p.m. UTC 
From: "hongbo.zhang" <hongbo.zhang@linaro.com>

In the while loop for counting cpu frequencies, if table[i].frequency equals
CPUFREQ_ENTRY_INVALID, index i won't be increased, so this leads to an endless
loop, what's more the index i cannot be referred as cpu frequencies number if
there is CPUFREQ_ENTRY_INVALID case.

Signed-off-by: hongbo.zhang <hongbo.zhang@linaro.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Amit Daniel Kachhap <amit.kachhap@linaro.org>
---
 drivers/thermal/cpu_cooling.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

Comments

Zhang Rui Nov. 7, 2012, 6:54 a.m. UTC | #1 
On Tue, 2012-10-30 at 17:48 +0100, hongbo.zhang wrote:
> From: "hongbo.zhang" <hongbo.zhang@linaro.com>
> 
> In the while loop for counting cpu frequencies, if table[i].frequency equals
> CPUFREQ_ENTRY_INVALID, index i won't be increased, so this leads to an endless
> loop, what's more the index i cannot be referred as cpu frequencies number if
> there is CPUFREQ_ENTRY_INVALID case.
> 
> Signed-off-by: hongbo.zhang <hongbo.zhang@linaro.com>
> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
> Reviewed-by: Amit Daniel Kachhap <amit.kachhap@linaro.org>

applied to thermal-next.

thanks,
rui
> ---
>  drivers/thermal/cpu_cooling.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
> index b6b4c2a..bfd62b7 100644
> --- a/drivers/thermal/cpu_cooling.c
> +++ b/drivers/thermal/cpu_cooling.c
> @@ -245,6 +245,7 @@ static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
>  	struct cpumask *maskPtr;
>  	unsigned int cpu;
>  	struct cpufreq_frequency_table *table;
> +	unsigned long count = 0;
>  
>  	mutex_lock(&cooling_cpufreq_lock);
>  	list_for_each_entry(cpufreq_device, &cooling_cpufreq_list, node) {
> @@ -263,13 +264,14 @@ static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
>  		goto return_get_max_state;
>  	}
>  
> -	while (table[i].frequency != CPUFREQ_TABLE_END) {
> +	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
>  		if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
>  			continue;
> -		i++;
> +		count++;
>  	}
> -	if (i > 0) {
> -		*state = --i;
> +
> +	if (count > 0) {
> +		*state = --count;
>  		ret = 0;
>  	}
>  


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diff mbox

Patch

diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index b6b4c2a..bfd62b7 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -245,6 +245,7 @@  static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
 	struct cpumask *maskPtr;
 	unsigned int cpu;
 	struct cpufreq_frequency_table *table;
+	unsigned long count = 0;
 
 	mutex_lock(&cooling_cpufreq_lock);
 	list_for_each_entry(cpufreq_device, &cooling_cpufreq_list, node) {
@@ -263,13 +264,14 @@  static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
 		goto return_get_max_state;
 	}
 
-	while (table[i].frequency != CPUFREQ_TABLE_END) {
+	for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
 		if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
 			continue;
-		i++;
+		count++;
 	}
-	if (i > 0) {
-		*state = --i;
+
+	if (count > 0) {
+		*state = --count;
 		ret = 0;
 	}