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PM / devfreq: Fix the bug of devfreq_add_device when governor is NULL

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commit 73613b16cb5c5d5a659fc8832eff99eead3f9afb upstream.

This patch fixes the bug of devfreq_add_device(). The devfreq device must
have the default governor. If find_devfreq_governor() returns error,
devfreq_add_device() fail to add the devfreq instance.

Fixes: 1b5c1be2c88e (PM / devfreq: map devfreq drivers to governor using name)
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chanwoo Choi 2016-12-28 20:52:35 +09:00 committed by Greg Kroah-Hartman
parent 7959835473
commit ebdfcaa14e
1 changed files with 10 additions and 5 deletions
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15
drivers/devfreq/devfreq.c
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@ -593,11 +593,16 @@ struct devfreq *devfreq_add_device(struct device *dev,
list_add(&devfreq->node, &devfreq_list);
governor = find_devfreq_governor(devfreq->governor_name);
if (!IS_ERR(governor))
devfreq->governor = governor;
if (devfreq->governor)
err = devfreq->governor->event_handler(devfreq,
DEVFREQ_GOV_START, NULL);
if (IS_ERR(governor)) {
dev_err(dev, "%s: Unable to find governor for the device\n",
__func__);
err = PTR_ERR(governor);
goto err_init;
}
devfreq->governor = governor;
err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START,
NULL);
if (err) {
dev_err(dev, "%s: Unable to start governor for the device\n",
__func__);