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PM / devfreq: Add proper locking around list_del()

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Use devfreq_list_lock around list_del() to prevent list corruption.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Axel Lin 2016-09-29 10:13:28 +08:00 committed by Rafael J. Wysocki
parent 3b91f4b361
commit 0f376c9cd8
1 changed files with 3 additions and 1 deletions
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4
drivers/devfreq/devfreq.c
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@ -594,17 +594,19 @@ struct devfreq *devfreq_add_device(struct device *dev,
if (devfreq->governor)
err = devfreq->governor->event_handler(devfreq,
DEVFREQ_GOV_START, NULL);
mutex_unlock(&devfreq_list_lock);
if (err) {
dev_err(dev, "%s: Unable to start governor for the device\n",
__func__);
goto err_init;
}
mutex_unlock(&devfreq_list_lock);
return devfreq;
err_init:
list_del(&devfreq->node);
mutex_unlock(&devfreq_list_lock);
device_unregister(&devfreq->dev);
err_out:
return ERR_PTR(err);