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Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
-rw-r--r--drivers/cpufreq/cpufreq.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index b0dfd3222013..f53fb41efb7b 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -923,7 +923,12 @@ static ssize_t store(struct kobject *kobj, struct attribute *attr,
struct freq_attr *fattr = to_attr(attr);
ssize_t ret = -EINVAL;
- cpus_read_lock();
+ /*
+ * cpus_read_trylock() is used here to work around a circular lock
+ * dependency problem with respect to the cpufreq_register_driver().
+ */
+ if (!cpus_read_trylock())
+ return -EBUSY;
if (cpu_online(policy->cpu)) {
down_write(&policy->rwsem);
@@ -2236,6 +2241,7 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
policy->min = new_policy->min;
policy->max = new_policy->max;
+ trace_cpu_frequency_limits(policy);
policy->cached_target_freq = UINT_MAX;