acpi_pad: fix power_saving thread deadlock

[karo-tx-linux.git] / drivers / acpi / acpi_pad.c

diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index a43fa1a57d57f45616c9d70c362df15d3b71c8e5..1502c50273b5431f95e04f9be7de11356d1a8f98 100644 (file)
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -36,6 +36,7 @@
 #define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"
 #define ACPI_PROCESSOR_AGGREGATOR_NOTIFY 0x80
 static DEFINE_MUTEX(isolated_cpus_lock);
+static DEFINE_MUTEX(round_robin_lock);
 
 static unsigned long power_saving_mwait_eax;
 
@@ -107,7 +108,7 @@ static void round_robin_cpu(unsigned int tsk_index)
        if (!alloc_cpumask_var(&tmp, GFP_KERNEL))
                return;
 
-       mutex_lock(&isolated_cpus_lock);
+       mutex_lock(&round_robin_lock);
        cpumask_clear(tmp);
        for_each_cpu(cpu, pad_busy_cpus)
                cpumask_or(tmp, tmp, topology_thread_cpumask(cpu));
@@ -116,7 +117,7 @@ static void round_robin_cpu(unsigned int tsk_index)
        if (cpumask_empty(tmp))
                cpumask_andnot(tmp, cpu_online_mask, pad_busy_cpus);
        if (cpumask_empty(tmp)) {
-               mutex_unlock(&isolated_cpus_lock);
+               mutex_unlock(&round_robin_lock);
                return;
        }
        for_each_cpu(cpu, tmp) {
@@ -131,7 +132,7 @@ static void round_robin_cpu(unsigned int tsk_index)
        tsk_in_cpu[tsk_index] = preferred_cpu;
        cpumask_set_cpu(preferred_cpu, pad_busy_cpus);
        cpu_weight[preferred_cpu]++;
-       mutex_unlock(&isolated_cpus_lock);
+       mutex_unlock(&round_robin_lock);
 
        set_cpus_allowed_ptr(current, cpumask_of(preferred_cpu));
 }