[PATCH v2] PM / devfreq: mtk-cci: refactor error handling of probe and remove

[jia-wei.chang]

From: Jia-Wei Chang <jia-wei.chang at mediatek.com>

To refactor the regulator/clk handlers so it can follow the way of "Free
the Last Thing Style".

Changes since v2:
- Remove clk_prepare_enable call on parent clock.
- link to v1: Message ID: 20230503092742.19404-1-jia-wei.chang at mediatek.com

Signed-off-by: Jia-Wei Chang <jia-wei.chang at mediatek.com>
Fixes: b615b00c42da ("PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver")
---
 drivers/devfreq/mtk-cci-devfreq.c | 39 ++++++++++++++++---------------
 1 file changed, 20 insertions(+), 19 deletions(-)

diff --git a/drivers/devfreq/mtk-cci-devfreq.c b/drivers/devfreq/mtk-cci-devfreq.c
index e5458ada5197..c3fe2f52f04b 100644
--- a/drivers/devfreq/mtk-cci-devfreq.c
+++ b/drivers/devfreq/mtk-cci-devfreq.c
@@ -294,14 +294,14 @@ static int mtk_ccifreq_probe(struct platform_device *pdev)
 	if (IS_ERR(drv->sram_reg)) {
 		ret = PTR_ERR(drv->sram_reg);
 		if (ret == -EPROBE_DEFER)
-			goto out_free_resources;
+			goto out_disable_proc_reg;
 
 		drv->sram_reg = NULL;
 	} else {
 		ret = regulator_enable(drv->sram_reg);
 		if (ret) {
 			dev_err(dev, "failed to enable sram regulator\n");
-			goto out_free_resources;
+			goto out_disable_proc_reg;
 		}
 	}
 
@@ -316,12 +316,12 @@ static int mtk_ccifreq_probe(struct platform_device *pdev)
 
 	ret = clk_prepare_enable(drv->cci_clk);
 	if (ret)
-		goto out_free_resources;
+		goto out_disable_sram_reg;
 
 	ret = dev_pm_opp_of_add_table(dev);
 	if (ret) {
 		dev_err(dev, "failed to add opp table: %d\n", ret);
-		goto out_disable_cci_clk;
+		goto out_disable_cci_clock;
 	}
 
 	rate = clk_get_rate(drv->inter_clk);
@@ -329,7 +329,7 @@ static int mtk_ccifreq_probe(struct platform_device *pdev)
 	if (IS_ERR(opp)) {
 		ret = PTR_ERR(opp);
 		dev_err(dev, "failed to get intermediate opp: %d\n", ret);
-		goto out_remove_opp_table;
+		goto out_free_opp_table;
 	}
 	drv->inter_voltage = dev_pm_opp_get_voltage(opp);
 	dev_pm_opp_put(opp);
@@ -339,7 +339,7 @@ static int mtk_ccifreq_probe(struct platform_device *pdev)
 	if (IS_ERR(opp)) {
 		dev_err(dev, "failed to get opp\n");
 		ret = PTR_ERR(opp);
-		goto out_remove_opp_table;
+		goto out_free_opp_table;
 	}
 
 	opp_volt = dev_pm_opp_get_voltage(opp);
@@ -348,13 +348,13 @@ static int mtk_ccifreq_probe(struct platform_device *pdev)
 	if (ret) {
 		dev_err(dev, "failed to scale to highest voltage %lu in proc_reg\n",
 			opp_volt);
-		goto out_remove_opp_table;
+		goto out_free_opp_table;
 	}
 
 	passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL);
 	if (!passive_data) {
 		ret = -ENOMEM;
-		goto out_remove_opp_table;
+		goto out_free_opp_table;
 	}
 
 	passive_data->parent_type = CPUFREQ_PARENT_DEV;
@@ -365,29 +365,30 @@ static int mtk_ccifreq_probe(struct platform_device *pdev)
 		ret = -EPROBE_DEFER;
 		dev_err(dev, "failed to add devfreq device: %ld\n",
 			PTR_ERR(drv->devfreq));
-		goto out_remove_opp_table;
+		goto out_free_opp_table;
 	}
 
 	drv->opp_nb.notifier_call = mtk_ccifreq_opp_notifier;
 	ret = dev_pm_opp_register_notifier(dev, &drv->opp_nb);
 	if (ret) {
 		dev_err(dev, "failed to register opp notifier: %d\n", ret);
-		goto out_remove_opp_table;
+		goto out_free_opp_table;
 	}
 	return 0;
 
-out_remove_opp_table:
+out_free_opp_table:
 	dev_pm_opp_of_remove_table(dev);
 
-out_disable_cci_clk:
+out_disable_cci_clock:
 	clk_disable_unprepare(drv->cci_clk);
 
-out_free_resources:
-	if (regulator_is_enabled(drv->proc_reg))
-		regulator_disable(drv->proc_reg);
-	if (drv->sram_reg && regulator_is_enabled(drv->sram_reg))
+out_disable_sram_reg:
+	if (drv->sram_reg)
 		regulator_disable(drv->sram_reg);
 
+out_disable_proc_reg:
+	regulator_disable(drv->proc_reg);
+
 	return ret;
 }
 
@@ -398,12 +399,12 @@ static int mtk_ccifreq_remove(struct platform_device *pdev)
 
 	drv = platform_get_drvdata(pdev);
 
-	dev_pm_opp_unregister_notifier(dev, &drv->opp_nb);
-	dev_pm_opp_of_remove_table(dev);
-	clk_disable_unprepare(drv->cci_clk);
 	regulator_disable(drv->proc_reg);
 	if (drv->sram_reg)
 		regulator_disable(drv->sram_reg);
+	clk_disable_unprepare(drv->cci_clk);
+	dev_pm_opp_of_remove_table(dev);
+	dev_pm_opp_unregister_notifier(dev, &drv->opp_nb);
 
 	return 0;
 }
-- 
2.18.0