linux-kernel - [PATCH v2] PM / devfreq: exynos-bus: Reduce the numer of goto statements and remove unused headers

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Message-Id: <20191216104748.18877-1-a.swigon@samsung.com>
Date:   Mon, 16 Dec 2019 11:47:48 +0100
From:   Artur Świgoń <a.swigon@...sung.com>
To:     linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Artur Świgoń <a.swigon@...sung.com>,
        cw00.choi@...sung.com, myungjoo.ham@...sung.com,
        kyungmin.park@...sung.com, kgene@...nel.org, krzk@...nel.org,
        b.zolnierkie@...sung.com, m.szyprowski@...sung.com,
        inki.dae@...sung.com, sw0312.kim@...sung.com
Subject: [PATCH v2] PM / devfreq: exynos-bus: Reduce the numer of goto
 statements and remove unused headers

This patch improves code readability by changing the following construct:

    if (cond)
        goto passive;
    foo();
    goto out;
passive:
    bar();
out:

into this:

    if (cond)
        bar();
    else
        foo();

as well as eliminating a few more goto statements (related to return
paths).

Moreover, this patch removes unused header file includes and adds a missing
include <linux/of.h>.

Signed-off-by: Artur Świgoń <a.swigon@...sung.com>
---
 drivers/devfreq/exynos-bus.c | 54 +++++++++++++-----------------------
 1 file changed, 19 insertions(+), 35 deletions(-)

diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
index 19d9f9f8ced2..7f5917d59072 100644
--- a/drivers/devfreq/exynos-bus.c
+++ b/drivers/devfreq/exynos-bus.c
@@ -15,11 +15,10 @@
 #include <linux/device.h>
 #include <linux/export.h>
 #include <linux/module.h>
-#include <linux/of_device.h>
+#include <linux/of.h>
 #include <linux/pm_opp.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
-#include <linux/slab.h>
 
 #define DEFAULT_SATURATION_RATIO	40
 
@@ -301,10 +300,9 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
 	profile->exit = exynos_bus_exit;
 
 	ondemand_data = devm_kzalloc(dev, sizeof(*ondemand_data), GFP_KERNEL);
-	if (!ondemand_data) {
-		ret = -ENOMEM;
-		goto err;
-	}
+	if (!ondemand_data)
+		return -ENOMEM;
+
 	ondemand_data->upthreshold = 40;
 	ondemand_data->downdifferential = 5;
 
@@ -314,15 +312,14 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
 						ondemand_data);
 	if (IS_ERR(bus->devfreq)) {
 		dev_err(dev, "failed to add devfreq device\n");
-		ret = PTR_ERR(bus->devfreq);
-		goto err;
+		return PTR_ERR(bus->devfreq);
 	}
 
 	/* Register opp_notifier to catch the change of OPP  */
 	ret = devm_devfreq_register_opp_notifier(dev, bus->devfreq);
 	if (ret < 0) {
 		dev_err(dev, "failed to register opp notifier\n");
-		goto err;
+		return ret;
 	}
 
 	/*
@@ -332,17 +329,16 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
 	ret = exynos_bus_enable_edev(bus);
 	if (ret < 0) {
 		dev_err(dev, "failed to enable devfreq-event devices\n");
-		goto err;
+		return ret;
 	}
 
 	ret = exynos_bus_set_event(bus);
 	if (ret < 0) {
 		dev_err(dev, "failed to set event to devfreq-event devices\n");
-		goto err;
+		return ret;
 	}
 
-err:
-	return ret;
+	return 0;
 }
 
 static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
@@ -351,7 +347,6 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
 	struct device *dev = bus->dev;
 	struct devfreq_passive_data *passive_data;
 	struct devfreq *parent_devfreq;
-	int ret = 0;
 
 	/* Initialize the struct profile and governor data for passive device */
 	profile->target = exynos_bus_target;
@@ -359,16 +354,13 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
 
 	/* Get the instance of parent devfreq device */
 	parent_devfreq = devfreq_get_devfreq_by_phandle(dev, 0);
-	if (IS_ERR(parent_devfreq)) {
-		ret = -EPROBE_DEFER;
-		goto err;
-	}
+	if (IS_ERR(parent_devfreq))
+		return -EPROBE_DEFER;
 
 	passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL);
-	if (!passive_data) {
-		ret = -ENOMEM;
-		goto err;
-	}
+	if (!passive_data)
+		return -ENOMEM;
+
 	passive_data->parent = parent_devfreq;
 
 	/* Add devfreq device for exynos bus with passive governor */
@@ -377,12 +369,10 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
 	if (IS_ERR(bus->devfreq)) {
 		dev_err(dev,
 			"failed to add devfreq dev with passive governor\n");
-		ret = PTR_ERR(bus->devfreq);
-		goto err;
+		return PTR_ERR(bus->devfreq);
 	}
 
-err:
-	return ret;
+	return 0;
 }
 
 static int exynos_bus_probe(struct platform_device *pdev)
@@ -427,19 +417,13 @@ static int exynos_bus_probe(struct platform_device *pdev)
 		goto err_reg;
 
 	if (passive)
-		goto passive;
-
-	ret = exynos_bus_profile_init(bus, profile);
-	if (ret < 0)
-		goto err;
+		ret = exynos_bus_profile_init_passive(bus, profile);
+	else
+		ret = exynos_bus_profile_init(bus, profile);
 
-	goto out;
-passive:
-	ret = exynos_bus_profile_init_passive(bus, profile);
 	if (ret < 0)
 		goto err;
 
-out:
 	max_state = bus->devfreq->profile->max_state;
 	min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
 	max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
-- 
2.17.1