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: "Chanwoo Choi" <cw00.choi@samsung.com>, "Artur Świgoń" <a.swigon@partner.samsung.com>, "Saravana Kannan" <saravanak@google.com>, "Krzysztof Kozlowski" <krzk@kernel.org>, "Alexandre Bailon" <abailon@baylibre.com>, "Georgi Djakov" <georgi.djakov@linaro.org>, "Abel Vesa" <abel.vesa@nxp.com>, "Jacky Bai" <ping.bai@nxp.com>, "Viresh Kumar" <viresh.kumar@linaro.org>, "Lukasz Luba" <l.luba@partner.samsung.com>, "Martin Kepplinger" <martink@posteo.de>, "NXP Linux Team" <linux-imx@nxp.com>, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org 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
WARNING: multiple messages have this Message-ID (diff)
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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-09-23 21:10 UTC|newest] Thread overview: 36+ 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 2019-09-23 21:10 ` Leonard Crestez [this message] 2019-09-23 21:10 ` [PATCH v7 1/6] PM / devfreq: Don't fail devfreq_dev_release if not in list Leonard Crestez 2019-09-24 2:45 ` Chanwoo Choi 2019-09-24 2:45 ` Chanwoo Choi 2019-09-23 21:10 ` [PATCH v7 2/6] PM / devfreq: Move more initialization before registration Leonard Crestez 2019-09-23 21:10 ` Leonard Crestez 2019-09-24 2:57 ` Chanwoo Choi 2019-09-24 2:57 ` Chanwoo Choi 2019-09-24 8:00 ` Leonard Crestez 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 2019-09-23 21:10 ` Leonard Crestez 2019-09-24 3:13 ` Chanwoo Choi 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 2019-09-23 21:10 ` Leonard Crestez 2019-09-24 5:13 ` Chanwoo Choi 2019-09-24 5:13 ` Chanwoo Choi 2019-09-24 8:54 ` Leonard Crestez 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 21:10 ` Leonard Crestez 2019-09-23 21:42 ` Matthias Kaehlcke 2019-09-23 21:42 ` Matthias Kaehlcke 2019-09-24 6:52 ` Chanwoo Choi 2019-09-24 6:52 ` Chanwoo Choi 2019-09-24 9:27 ` Leonard Crestez 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 2019-09-23 21:10 ` Leonard Crestez 2019-09-24 7:26 ` Chanwoo Choi 2019-09-24 7:26 ` Chanwoo Choi 2019-09-24 9:48 ` Leonard Crestez 2019-09-24 9:48 ` Leonard Crestez
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