[PATCH 2/3] PM / devfreq: fix missing check of return value in devfreq_add_device()

[Yangtao Li]

devm_kzalloc() could fail, so insert a check of its return value. And
if it fails, returns -ENOMEM.

Signed-off-by: Yangtao Li <tiny.win...@gmail.com>
---
 drivers/devfreq/devfreq.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 076b1c2f40a4..923889229a0b 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -688,10 +688,22 @@ struct devfreq *devfreq_add_device(struct device *dev,
                                            devfreq->profile->max_state,
                                            devfreq->profile->max_state),
                                            GFP_KERNEL);
+       if (!devfreq->trans_table) {
+               mutex_unlock(&devfreq->lock);
+               err = -ENOMEM;
+               goto err_devfreq;
+       }
+
        devfreq->time_in_state = devm_kcalloc(&devfreq->dev,
                                              devfreq->profile->max_state,
                                              sizeof(unsigned long),
                                              GFP_KERNEL);
+       if (!devfreq->time_in_state) {
+               mutex_unlock(&devfreq->lock);
+               err = -ENOMEM;
+               goto err_devfreq;
+       }
+
        devfreq->last_stat_updated = jiffies;
 
        srcu_init_notifier_head(&devfreq->transition_notifier_list);
@@ -725,7 +737,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
 
 err_init:
        mutex_unlock(&devfreq_list_lock);
-
+err_devfreq:
        devfreq_remove_device(devfreq);
        devfreq = NULL;
 err_dev:
-- 
2.17.0