linux-kernel - [PATCH mvebu v3 10/10] cpufreq: armada-37xx: Fix module unloading

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Date:   Mon, 22 Feb 2021 20:41:58 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Gregory Clement <gregory.clement@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org
Cc:     Marek Behún <kabel@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Tomasz Maciej Nowak <tmn505@...il.com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Andre Heider <a.heider@...il.com>,
        Vladimir Vid <vladimir.vid@...tura.hr>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Gérald Kerma <gerald@....net>,
        Konstantin Porotchkin <kostap@...vell.com>
Subject: [PATCH mvebu v3 10/10] cpufreq: armada-37xx: Fix module unloading

This driver is missing module_exit hook. Add proper driver exit function
which unregisters the platform device and cleans up the data.

Signed-off-by: Pali Rohár <pali@...nel.org>
Tested-by: Tomasz Maciej Nowak <tmn505@...il.com>
Tested-by: Anders Trier Olesen <anders.trier.olesen@...il.com>
Tested-by: Philip Soares <philips@...isense.com>
---
 drivers/cpufreq/armada-37xx-cpufreq.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/cpufreq/armada-37xx-cpufreq.c b/drivers/cpufreq/armada-37xx-cpufreq.c
index 050abff18308..3fc98a3ffd91 100644
--- a/drivers/cpufreq/armada-37xx-cpufreq.c
+++ b/drivers/cpufreq/armada-37xx-cpufreq.c
@@ -86,6 +86,8 @@ static int avs_map[] = {
 };
 
 struct armada37xx_cpufreq_state {
+	struct platform_device *pdev;
+	struct device *cpu_dev;
 	struct regmap *regmap;
 	u32 nb_l0l1;
 	u32 nb_l2l3;
@@ -506,6 +508,9 @@ static int __init armada37xx_cpufreq_driver_init(void)
 	if (ret)
 		goto disable_dvfs;
 
+	armada37xx_cpufreq_state->cpu_dev = cpu_dev;
+	armada37xx_cpufreq_state->pdev = pdev;
+	platform_set_drvdata(pdev, dvfs);
 	return 0;
 
 disable_dvfs:
@@ -524,6 +529,26 @@ static int __init armada37xx_cpufreq_driver_init(void)
 /* late_initcall, to guarantee the driver is loaded after A37xx clock driver */
 late_initcall(armada37xx_cpufreq_driver_init);
 
+static void __exit armada37xx_cpufreq_driver_exit(void)
+{
+	struct platform_device *pdev = armada37xx_cpufreq_state->pdev;
+	struct armada_37xx_dvfs *dvfs = platform_get_drvdata(pdev);
+	unsigned long freq;
+	int load_lvl;
+
+	platform_device_unregister(pdev);
+
+	armada37xx_cpufreq_disable_dvfs(armada37xx_cpufreq_state->regmap);
+
+	for (load_lvl = ARMADA_37XX_DVFS_LOAD_0; load_lvl < LOAD_LEVEL_NR; load_lvl++) {
+		freq = dvfs->cpu_freq_max / dvfs->divider[load_lvl];
+		dev_pm_opp_remove(armada37xx_cpufreq_state->cpu_dev, freq);
+	}
+
+	kfree(armada37xx_cpufreq_state);
+}
+module_exit(armada37xx_cpufreq_driver_exit);
+
 static const struct of_device_id __maybe_unused armada37xx_cpufreq_of_match[] = {
 	{ .compatible = "marvell,armada-3700-nb-pm" },
 	{ },
-- 
2.20.1