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cpufreq: Remove cpufreq_frequency_get_table()

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Most of the callers of cpufreq_frequency_get_table() already have the
pointer to a valid 'policy' structure and they don't really need to go
through the per-cpu variable first and then a check to validate the
frequency, in order to find the freq-table for the policy.

Directly use the policy->freq_table field instead for them.

Only one user of that API is left after above changes, cpu_cooling.c and
it accesses the freq_table in a racy way as the policy can get freed in
between.

Fix it by using cpufreq_cpu_get() properly.

Since there are no more users of cpufreq_frequency_get_table() left, get
rid of it.

Signed-off-by: Viresh Kumar <[email protected]>
Acked-by: Javi Merino <[email protected]> (cpu_cooling.c)
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Viresh Kumar 2016-06-03 10:58:47 +05:30 • committed by Rafael J. Wysocki
commit f8bfc116ca
7 changed files with 39 additions and 42 deletions
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26
drivers/thermal/cpu_cooling.c
View file

@ -787,22 +787,34 @@ __cpufreq_cooling_register(struct device_node *np,
const struct cpumask *clip_cpus, u32 capacitance,
get_static_t plat_static_func)
{
struct cpufreq_policy *policy;
struct thermal_cooling_device *cool_dev;
struct cpufreq_cooling_device *cpufreq_dev;
char dev_name[THERMAL_NAME_LENGTH];
struct cpufreq_frequency_table *pos, *table;
struct cpumask temp_mask;
unsigned int freq, i, num_cpus;
int ret;
table = cpufreq_frequency_get_table(cpumask_first(clip_cpus));
if (!table) {
pr_debug("%s: CPUFreq table not found\n", __func__);
cpumask_and(&temp_mask, clip_cpus, cpu_online_mask);
policy = cpufreq_cpu_get(cpumask_first(&temp_mask));
if (!policy) {
pr_debug("%s: CPUFreq policy not found\n", __func__);
return ERR_PTR(-EPROBE_DEFER);
}
table = policy->freq_table;
if (!table) {
pr_debug("%s: CPUFreq table not found\n", __func__);
cool_dev = ERR_PTR(-ENODEV);
goto put_policy;
}
cpufreq_dev = kzalloc(sizeof(*cpufreq_dev), GFP_KERNEL);
if (!cpufreq_dev)
return ERR_PTR(-ENOMEM);
if (!cpufreq_dev) {
cool_dev = ERR_PTR(-ENOMEM);
goto put_policy;
}
num_cpus = cpumask_weight(clip_cpus);
cpufreq_dev->time_in_idle = kcalloc(num_cpus,
@ -892,7 +904,7 @@ __cpufreq_cooling_register(struct device_node *np,
CPUFREQ_POLICY_NOTIFIER);
mutex_unlock(&cooling_cpufreq_lock);
return cool_dev;
goto put_policy;
remove_idr:
release_idr(&cpufreq_idr, cpufreq_dev->id);
@ -906,6 +918,8 @@ free_time_in_idle:
kfree(cpufreq_dev->time_in_idle);
free_cdev:
kfree(cpufreq_dev);
put_policy:
cpufreq_cpu_put(policy);
return cool_dev;
}