[PATCH v2 11/19] PM / devfreq: tegra: De-initialize properly on driver's probe error

[Dmitry Osipenko]

Reset hardware, disable ACTMON clock, release OPP's and free IRQ before
removing devfreq device since there is no guarantee that interrupt
handling won't run after masking interrupt in hardware.

Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
 drivers/devfreq/tegra-devfreq.c | 53 ++++++++++++++++-----------------
 1 file changed, 26 insertions(+), 27 deletions(-)

diff --git a/drivers/devfreq/tegra-devfreq.c b/drivers/devfreq/tegra-devfreq.c
index 69b557df5084..a668e4fbc874 100644
--- a/drivers/devfreq/tegra-devfreq.c
+++ b/drivers/devfreq/tegra-devfreq.c
@@ -663,28 +663,28 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);
-		return irq;
+		err = irq;
+		dev_err(&pdev->dev, "Failed to get IRQ: %d\n", err);
+		goto remove_opps;
 	}
 
 	platform_set_drvdata(pdev, tegra);
 
 	tegra_devfreq_profile.initial_freq = clk_get_rate(tegra->emc_clock);
-	tegra->devfreq = devm_devfreq_add_device(&pdev->dev,
-						 &tegra_devfreq_profile,
-						 "tegra_actmon",
-						 NULL);
+	tegra->devfreq = devfreq_add_device(&pdev->dev,
+					    &tegra_devfreq_profile,
+					    "tegra_actmon",
+					    NULL);
 	if (IS_ERR(tegra->devfreq)) {
 		err = PTR_ERR(tegra->devfreq);
-		return err;
+		goto remove_opps;
 	}
 
-	err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
-					actmon_thread_isr, IRQF_ONESHOT,
-					"tegra-devfreq", tegra);
+	err = request_threaded_irq(irq, NULL, actmon_thread_isr, IRQF_ONESHOT,
+				   "tegra-devfreq", tegra);
 	if (err) {
 		dev_err(&pdev->dev, "Interrupt request failed\n");
-		goto remove_opps;
+		goto remove_devfreq;
 	}
 
 	tegra->rate_change_nb.notifier_call = tegra_actmon_rate_notify_cb;
@@ -692,14 +692,23 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
 	if (err) {
 		dev_err(&pdev->dev,
 			"Failed to register rate change notifier\n");
-		goto remove_opps;
+		goto disable_interrupt;
 	}
 
 	return 0;
 
+disable_interrupt:
+	free_irq(irq, tegra);
+
+remove_devfreq:
+	devfreq_remove_device(tegra->devfreq);
+
 remove_opps:
 	dev_pm_opp_remove_all_dynamic(&pdev->dev);
 
+	reset_control_reset(tegra->reset);
+	clk_disable_unprepare(tegra->clock);
+
 	return err;
 }
 
@@ -707,24 +716,14 @@ static int tegra_devfreq_remove(struct platform_device *pdev)
 {
 	struct tegra_devfreq *tegra = platform_get_drvdata(pdev);
 	int irq = platform_get_irq(pdev, 0);
-	u32 val;
-	unsigned int i;
-
-	devm_devfreq_remove_device(&pdev->dev, tegra->devfreq);
-	dev_pm_opp_remove_all_dynamic(&pdev->dev);
-
-	for (i = 0; i < ARRAY_SIZE(actmon_device_configs); i++) {
-		val = device_readl(&tegra->devices[i], ACTMON_DEV_CTRL);
-		val &= ~ACTMON_DEV_CTRL_ENB;
-		device_writel(&tegra->devices[i], val, ACTMON_DEV_CTRL);
-	}
-
-	actmon_write_barrier(tegra);
-
-	devm_free_irq(&pdev->dev, irq, tegra);
 
 	clk_notifier_unregister(tegra->emc_clock, &tegra->rate_change_nb);
+	free_irq(irq, tegra);
+
+	devfreq_remove_device(tegra->devfreq);
+	dev_pm_opp_remove_all_dynamic(&pdev->dev);
 
+	reset_control_reset(tegra->reset);
 	clk_disable_unprepare(tegra->clock);
 
 	return 0;
-- 
2.21.0