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>, "NXP Linux Team" <linux-imx@nxp.com>, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v8 1/6] PM / devfreq: Don't fail devfreq_dev_release if not in list Date: Tue, 24 Sep 2019 13:11:25 +0300 [thread overview] Message-ID: <bdca660b9356993a1ff6e25bee15356205a00de9.1569319738.git.leonard.crestez@nxp.com> (raw) In-Reply-To: <cover.1569319738.git.leonard.crestez@nxp.com> In-Reply-To: <cover.1569319738.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> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> --- 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 a2a045e117f0..12c4bcdc1f17 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>, "Georgi Djakov" <georgi.djakov@linaro.org>, linux-arm-kernel@lists.infradead.org, "Jacky Bai" <ping.bai@nxp.com> Subject: [PATCH v8 1/6] PM / devfreq: Don't fail devfreq_dev_release if not in list Date: Tue, 24 Sep 2019 13:11:25 +0300 [thread overview] Message-ID: <bdca660b9356993a1ff6e25bee15356205a00de9.1569319738.git.leonard.crestez@nxp.com> (raw) In-Reply-To: <cover.1569319738.git.leonard.crestez@nxp.com> In-Reply-To: <cover.1569319738.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> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> --- 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 a2a045e117f0..12c4bcdc1f17 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:[~2019-09-24 10:11 UTC|newest] Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <CGME20190924101140epcas1p4abeedf42f223e65f58c88a0ddf1e4e56@epcas1p4.samsung.com> 2019-09-24 10:11 ` [PATCH v8 0/6] PM / devfreq: Add dev_pm_qos support Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez [this message] 2019-09-24 10:11 ` [PATCH v8 1/6] PM / devfreq: Don't fail devfreq_dev_release if not in list Leonard Crestez 2019-09-24 10:11 ` [PATCH v8 2/6] PM / devfreq: Move more initialization before registration Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-25 1:46 ` Chanwoo Choi 2019-09-25 1:46 ` Chanwoo Choi 2019-09-24 10:11 ` [PATCH v8 3/6] PM / devfreq: Don't take lock in devfreq_add_device Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-24 10:11 ` [PATCH v8 4/6] PM / devfreq: Introduce get_freq_range helper Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-25 1:37 ` Chanwoo Choi 2019-09-25 1:37 ` Chanwoo Choi 2019-09-25 20:55 ` Leonard Crestez 2019-09-25 20:55 ` Leonard Crestez 2019-09-26 1:06 ` Chanwoo Choi 2019-09-26 1:06 ` Chanwoo Choi 2019-09-26 14:03 ` Leonard Crestez 2019-09-26 14:03 ` Leonard Crestez 2019-09-24 10:11 ` [PATCH v8 5/6] PM / devfreq: Add PM QoS support Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-24 19:11 ` Matthias Kaehlcke 2019-09-24 19:11 ` Matthias Kaehlcke 2019-09-24 19:22 ` Leonard Crestez 2019-09-24 19:22 ` Leonard Crestez 2019-09-25 2:17 ` Chanwoo Choi 2019-09-25 2:17 ` Chanwoo Choi 2019-09-25 19:40 ` Leonard Crestez 2019-09-25 19:40 ` Leonard Crestez 2019-09-26 1:08 ` Chanwoo Choi 2019-09-26 1:08 ` Chanwoo Choi 2019-09-25 2:15 ` Chanwoo Choi 2019-09-25 2:15 ` Chanwoo Choi 2019-09-25 16:06 ` Matthias Kaehlcke 2019-09-25 16:06 ` Matthias Kaehlcke 2019-09-25 21:18 ` Leonard Crestez 2019-09-25 21:18 ` Leonard Crestez 2019-09-26 1:12 ` Chanwoo Choi 2019-09-26 1:12 ` Chanwoo Choi 2019-09-26 13:43 ` Leonard Crestez 2019-09-26 13:43 ` Leonard Crestez 2019-09-27 1:49 ` Chanwoo Choi 2019-09-27 1:49 ` Chanwoo Choi 2019-09-30 13:16 ` Leonard Crestez 2019-09-30 13:16 ` Leonard Crestez 2019-09-30 21:42 ` Chanwoo Choi 2019-09-30 21:42 ` Chanwoo Choi 2019-10-01 9:39 ` Leonard Crestez 2019-10-01 9:39 ` Leonard Crestez 2019-10-01 21:55 ` Chanwoo Choi 2019-10-01 21:55 ` Chanwoo Choi 2019-09-26 1:19 ` Chanwoo Choi 2019-09-26 1:19 ` Chanwoo Choi 2019-09-30 12:43 ` Leonard Crestez 2019-09-30 12:43 ` Leonard Crestez 2019-09-30 21:21 ` Chanwoo Choi 2019-09-30 21:21 ` Chanwoo Choi 2019-09-24 10:11 ` [PATCH v8 6/6] PM / devfreq: Use PM QoS for sysfs min/max_freq Leonard Crestez 2019-09-24 10:11 ` Leonard Crestez 2019-09-25 2:41 ` Chanwoo Choi 2019-09-25 2:41 ` Chanwoo Choi 2019-09-25 16:45 ` Matthias Kaehlcke 2019-09-25 16:45 ` Matthias Kaehlcke 2019-09-26 1:25 ` Chanwoo Choi 2019-09-26 1:25 ` Chanwoo Choi 2019-09-26 16:04 ` Matthias Kaehlcke 2019-09-26 16:04 ` Matthias Kaehlcke 2019-09-27 1:58 ` Chanwoo Choi 2019-09-27 1:58 ` Chanwoo Choi 2019-09-25 22:11 ` Leonard Crestez 2019-09-25 22:11 ` Leonard Crestez 2019-09-26 1:26 ` Chanwoo Choi 2019-09-26 1:26 ` Chanwoo Choi 2019-09-25 1:44 ` [PATCH v8 0/6] PM / devfreq: Add dev_pm_qos support Chanwoo Choi 2019-09-25 1:44 ` Chanwoo Choi 2019-09-25 19:37 ` Leonard Crestez 2019-09-25 19:37 ` Leonard Crestez [not found] ` <CGME20190924101139epcas1p4c6799a5de9bdb4e90abb74de1e881388@epcms1p4> 2019-09-25 1:58 ` [PATCH v8 2/6] PM / devfreq: Move more initialization before registration MyungJoo Ham 2019-09-25 1:58 ` MyungJoo Ham 2019-09-25 19:33 ` Leonard Crestez 2019-09-25 19:33 ` Leonard Crestez
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