From: Dmitry Osipenko <digetx@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
MyungJoo Ham <myungjoo.ham@samsung.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Chanwoo Choi <cw00.choi@samsung.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v6 12/19] PM / devfreq: tegra30: Move clk-notifier's registration to governor's start
Date: Mon, 12 Aug 2019 00:23:08 +0300 [thread overview]
Message-ID: <20190811212315.12689-13-digetx@gmail.com> (raw)
In-Reply-To: <20190811212315.12689-1-digetx@gmail.com>
There is no point in receiving of the notifications while governor is
stopped, let's keep them disabled like we do for the CPU freq-change
notifications. This also fixes a potential use-after-free bug if
notification happens after device's removal.
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/devfreq/tegra30-devfreq.c | 33 ++++++++++++++++++-------------
1 file changed, 19 insertions(+), 14 deletions(-)
diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index a260812f7744..bad9836b1eea 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -726,6 +726,19 @@ static int tegra_actmon_start(struct tegra_devfreq *tegra)
actmon_writel(tegra, ACTMON_SAMPLING_PERIOD - 1,
ACTMON_GLB_PERIOD_CTRL);
+ /*
+ * CLK notifications are needed in order to reconfigure the upper
+ * consecutive watermark in accordance to the actual clock rate
+ * to avoid unnecessary upper interrupts.
+ */
+ err = clk_notifier_register(tegra->emc_clock,
+ &tegra->clk_rate_change_nb);
+ if (err) {
+ dev_err(tegra->devfreq->dev.parent,
+ "Failed to register rate change notifier\n");
+ return err;
+ }
+
for (i = 0; i < ARRAY_SIZE(tegra->devices); i++)
tegra_actmon_configure_device(tegra, &tegra->devices[i]);
@@ -752,6 +765,8 @@ static int tegra_actmon_start(struct tegra_devfreq *tegra)
for (i = 0; i < ARRAY_SIZE(tegra->devices); i++)
tegra_actmon_stop_device(&tegra->devices[i]);
+ clk_notifier_unregister(tegra->emc_clock, &tegra->clk_rate_change_nb);
+
return err;
}
@@ -768,6 +783,8 @@ static void tegra_actmon_stop(struct tegra_devfreq *tegra)
for (i = 0; i < ARRAY_SIZE(tegra->devices); i++)
tegra_actmon_stop_device(&tegra->devices[i]);
+
+ clk_notifier_unregister(tegra->emc_clock, &tegra->clk_rate_change_nb);
}
static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
@@ -1012,24 +1029,16 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, tegra);
+ tegra->clk_rate_change_nb.notifier_call = tegra_actmon_clk_notify_cb;
tegra->cpu_rate_change_nb.notifier_call = tegra_actmon_cpu_notify_cb;
INIT_DELAYED_WORK(&tegra->cpufreq_update_work,
tegra_actmon_delayed_update);
- tegra->clk_rate_change_nb.notifier_call = tegra_actmon_clk_notify_cb;
- err = clk_notifier_register(tegra->emc_clock,
- &tegra->clk_rate_change_nb);
- if (err) {
- dev_err(&pdev->dev,
- "Failed to register rate change notifier\n");
- goto remove_opps;
- }
-
err = devfreq_add_governor(&tegra_devfreq_governor);
if (err) {
dev_err(&pdev->dev, "Failed to add governor: %d\n", err);
- goto unreg_notifier;
+ goto remove_opps;
}
tegra_devfreq_profile.initial_freq = clk_get_rate(tegra->emc_clock);
@@ -1047,9 +1056,6 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
remove_governor:
devfreq_remove_governor(&tegra_devfreq_governor);
-unreg_notifier:
- clk_notifier_unregister(tegra->emc_clock, &tegra->clk_rate_change_nb);
-
remove_opps:
dev_pm_opp_remove_all_dynamic(&pdev->dev);
@@ -1066,7 +1072,6 @@ static int tegra_devfreq_remove(struct platform_device *pdev)
devfreq_remove_device(tegra->devfreq);
devfreq_remove_governor(&tegra_devfreq_governor);
- clk_notifier_unregister(tegra->emc_clock, &tegra->clk_rate_change_nb);
dev_pm_opp_remove_all_dynamic(&pdev->dev);
reset_control_reset(tegra->reset);
--
2.22.0
next prev parent reply other threads:[~2019-08-11 21:25 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-11 21:22 [PATCH v6 00/19] More improvements for Tegra30 devfreq driver Dmitry Osipenko
2019-08-11 21:22 ` [PATCH v6 01/19] PM / devfreq: tegra30: Change irq type to unsigned int Dmitry Osipenko
2019-08-11 21:22 ` [PATCH v6 02/19] PM / devfreq: tegra30: Keep interrupt disabled while governor is stopped Dmitry Osipenko
2019-08-20 0:02 ` Chanwoo Choi
2019-08-11 21:22 ` [PATCH v6 03/19] PM / devfreq: tegra30: Handle possible round-rate error Dmitry Osipenko
2019-08-20 0:06 ` Chanwoo Choi
2019-08-11 21:23 ` [PATCH v6 04/19] PM / devfreq: tegra30: Drop write-barrier Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 05/19] PM / devfreq: tegra30: Set up watermarks properly Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 06/19] PM / devfreq: tegra30: Tune up boosting thresholds Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 07/19] PM / devfreq: tegra30: Fix integer overflow on CPU's freq max out Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 08/19] PM / devfreq: tegra30: Ensure that target freq won't overflow Dmitry Osipenko
2019-08-20 0:23 ` Chanwoo Choi
2019-08-20 23:19 ` Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 09/19] PM / devfreq: tegra30: Use kHz units uniformly in the code Dmitry Osipenko
2019-10-01 23:29 ` Chanwoo Choi
2019-10-02 18:26 ` Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 10/19] PM / devfreq: tegra30: Reduce unnecessary interrupts activity Dmitry Osipenko
2019-10-01 23:35 ` Chanwoo Choi
2019-10-02 18:40 ` Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 11/19] PM / devfreq: tegra30: Use CPUFreq notifier Dmitry Osipenko
2019-10-02 0:02 ` Chanwoo Choi
2019-10-02 14:06 ` Dmitry Osipenko
2019-08-11 21:23 ` Dmitry Osipenko [this message]
2019-08-11 21:23 ` [PATCH v6 13/19] PM / devfreq: tegra30: Reset boosting on startup Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 14/19] PM / devfreq: tegra30: Don't enable consecutive-down interrupt " Dmitry Osipenko
2019-10-02 0:04 ` Chanwoo Choi
2019-08-11 21:23 ` [PATCH v6 15/19] PM / devfreq: tegra30: Constify structs Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 16/19] PM / devfreq: tegra30: Include appropriate header Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 17/19] PM / devfreq: tegra30: Increase sampling period to 16ms Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 18/19] PM / devfreq: tegra30: Support variable polling interval Dmitry Osipenko
2019-10-02 0:18 ` Chanwoo Choi
2019-10-02 15:27 ` Dmitry Osipenko
2019-08-11 21:23 ` [PATCH v6 19/19] PM / devfreq: tegra20/30: Add Dmitry as a maintainer Dmitry Osipenko
2019-10-01 21:15 ` [PATCH v6 00/19] More improvements for Tegra30 devfreq driver Dmitry Osipenko
2019-10-02 0:25 ` Chanwoo Choi
2019-10-02 13:54 ` Dmitry Osipenko
2019-10-05 16:29 ` Peter Geis
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