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cpufreq interactive governor save/restore IRQs around cpumask spinlocks

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Need to use irqsave/restore spin locking for cpumasks since these
are accessed in timers and in thread context.

Change-Id: I4a53eaf0ced7e73b445feddba90ec11482de9126
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Todd Poynor
2010-12-03 11:20:09 -08:00
committed by Colin Cross
parent 1dab2597e7
commit 1c4f95f819
1 changed files with 13 additions and 10 deletions
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23
drivers/cpufreq/cpufreq_interactive.c
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@@ -180,6 +180,7 @@ static void cpufreq_interactive_timer(unsigned long data)
u64 now_idle;
unsigned int new_freq;
unsigned int index;
unsigned long flags;
/*
* Once pcpu->timer_run_time is updated to >= pcpu->idle_exit_time,
@@ -280,18 +281,18 @@ static void cpufreq_interactive_timer(unsigned long data)
if (new_freq < pcpu->target_freq) {
pcpu->target_freq = new_freq;
spin_lock(&down_cpumask_lock);
spin_lock_irqsave(&down_cpumask_lock, flags);
cpumask_set_cpu(data, &down_cpumask);
spin_unlock(&down_cpumask_lock);
spin_unlock_irqrestore(&down_cpumask_lock, flags);
queue_work(down_wq, &freq_scale_down_work);
} else {
pcpu->target_freq = new_freq;
#if DEBUG
up_request_time = ktime_to_us(ktime_get());
#endif
spin_lock(&up_cpumask_lock);
spin_lock_irqsave(&up_cpumask_lock, flags);
cpumask_set_cpu(data, &up_cpumask);
spin_unlock(&up_cpumask_lock);
spin_unlock_irqrestore(&up_cpumask_lock, flags);
wake_up_process(up_task);
}
@@ -423,6 +424,7 @@ static int cpufreq_interactive_up_task(void *data)
{
unsigned int cpu;
cpumask_t tmp_mask;
unsigned long flags;
struct cpufreq_interactive_cpuinfo *pcpu;
#if DEBUG
@@ -433,16 +435,16 @@ static int cpufreq_interactive_up_task(void *data)
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
spin_lock(&up_cpumask_lock);
spin_lock_irqsave(&up_cpumask_lock, flags);
if (cpumask_empty(&up_cpumask)) {
spin_unlock(&up_cpumask_lock);
spin_unlock_irqrestore(&up_cpumask_lock, flags);
schedule();
if (kthread_should_stop())
break;
spin_lock(&up_cpumask_lock);
spin_lock_irqsave(&up_cpumask_lock, flags);
}
set_current_state(TASK_RUNNING);
@@ -461,7 +463,7 @@ static int cpufreq_interactive_up_task(void *data)
tmp_mask = up_cpumask;
cpumask_clear(&up_cpumask);
spin_unlock(&up_cpumask_lock);
spin_unlock_irqrestore(&up_cpumask_lock, flags);
for_each_cpu(cpu, &tmp_mask) {
pcpu = &per_cpu(cpuinfo, cpu);
@@ -488,12 +490,13 @@ static void cpufreq_interactive_freq_down(struct work_struct *work)
{
unsigned int cpu;
cpumask_t tmp_mask;
unsigned long flags;
struct cpufreq_interactive_cpuinfo *pcpu;
spin_lock(&down_cpumask_lock);
spin_lock_irqsave(&down_cpumask_lock, flags);
tmp_mask = down_cpumask;
cpumask_clear(&down_cpumask);
spin_unlock(&down_cpumask_lock);
spin_unlock_irqrestore(&down_cpumask_lock, flags);
for_each_cpu(cpu, &tmp_mask) {
pcpu = &per_cpu(cpuinfo, cpu);