From: Leonard Crestez <leonard.crestez@nxp.com>
To: MyungJoo Ham <myungjoo.ham@samsung.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Matthias Kaehlcke <mka@chromium.org>
Cc: "Artur Świgoń" <a.swigon@partner.samsung.com>,
"Abel Vesa" <abel.vesa@nxp.com>,
"Saravana Kannan" <saravanak@google.com>,
linux-pm@vger.kernel.org,
"Viresh Kumar" <viresh.kumar@linaro.org>,
"NXP Linux Team" <linux-imx@nxp.com>,
"Krzysztof Kozlowski" <krzk@kernel.org>,
"Lukasz Luba" <l.luba@partner.samsung.com>,
"Chanwoo Choi" <cw00.choi@samsung.com>,
"Alexandre Bailon" <abailon@baylibre.com>,
"Martin Kepplinger" <martink@posteo.de>,
"Georgi Djakov" <georgi.djakov@linaro.org>,
linux-arm-kernel@lists.infradead.org,
"Jacky Bai" <ping.bai@nxp.com>
Subject: [PATCH v7 1/6] PM / devfreq: Don't fail devfreq_dev_release if not in list
Date: Tue, 24 Sep 2019 00:10:29 +0300 [thread overview]
Message-ID: <06523b8ebc7006e13d92032c2e8494d2a919deac.1569272883.git.leonard.crestez@nxp.com> (raw)
In-Reply-To: <cover.1569272883.git.leonard.crestez@nxp.com>
In-Reply-To: <cover.1569272883.git.leonard.crestez@nxp.com>
Right now devfreq_dev_release will print a warning and abort the rest of
the cleanup if the devfreq instance is not part of the global
devfreq_list. But this is a valid scenario, for example it can happen if
the governor can't be found or on any other init error that happens
after device_register.
Initialize devfreq->node to an empty list head in devfreq_add_device so
that list_del becomes a safe noop inside devfreq_dev_release and we can
continue the rest of the cleanup.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
---
drivers/devfreq/devfreq.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index e9e6c8f1dc4b..f5bea7350f72 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -582,15 +582,10 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type,
static void devfreq_dev_release(struct device *dev)
{
struct devfreq *devfreq = to_devfreq(dev);
mutex_lock(&devfreq_list_lock);
- if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) {
- mutex_unlock(&devfreq_list_lock);
- dev_warn(&devfreq->dev, "releasing devfreq which doesn't exist\n");
- return;
- }
list_del(&devfreq->node);
mutex_unlock(&devfreq_list_lock);
if (devfreq->profile->exit)
devfreq->profile->exit(devfreq->dev.parent);
@@ -641,10 +636,11 @@ struct devfreq *devfreq_add_device(struct device *dev,
mutex_init(&devfreq->lock);
mutex_lock(&devfreq->lock);
devfreq->dev.parent = dev;
devfreq->dev.class = devfreq_class;
devfreq->dev.release = devfreq_dev_release;
+ INIT_LIST_HEAD(&devfreq->node);
devfreq->profile = profile;
strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN);
devfreq->previous_freq = profile->initial_freq;
devfreq->last_status.current_frequency = profile->initial_freq;
devfreq->data = data;
--
2.17.1
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next prev parent reply other threads:[~2019-09-23 21:10 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-23 21:10 [PATCH v7 0/6] PM / devfreq: Add dev_pm_qos support Leonard Crestez
2019-09-23 21:10 ` Leonard Crestez [this message]
2019-09-24 2:45 ` [PATCH v7 1/6] PM / devfreq: Don't fail devfreq_dev_release if not in list Chanwoo Choi
2019-09-23 21:10 ` [PATCH v7 2/6] PM / devfreq: Move more initialization before registration Leonard Crestez
2019-09-24 2:57 ` Chanwoo Choi
2019-09-24 8:00 ` Leonard Crestez
2019-09-23 21:10 ` [PATCH v7 3/6] PM / devfreq: Don't take lock in devfreq_add_device Leonard Crestez
2019-09-24 3:13 ` Chanwoo Choi
2019-09-23 21:10 ` [PATCH v7 4/6] PM / devfreq: Introduce devfreq_get_freq_range Leonard Crestez
2019-09-24 5:13 ` Chanwoo Choi
2019-09-24 8:54 ` Leonard Crestez
2019-09-23 21:10 ` [PATCH v7 5/6] PM / devfreq: Add PM QoS support Leonard Crestez
2019-09-23 21:42 ` Matthias Kaehlcke
2019-09-24 6:52 ` Chanwoo Choi
2019-09-24 9:27 ` Leonard Crestez
2019-09-23 21:10 ` [PATCH v7 6/6] PM / devfreq: Use PM QoS for sysfs min/max_freq Leonard Crestez
2019-09-24 7:26 ` Chanwoo Choi
2019-09-24 9:48 ` Leonard Crestez
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