linux-kernel - [PATCH 9/9] gpio: mockup: refactor the module init function

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Message-Id: <20200924113842.11670-10-brgl@bgdev.pl>
Date:   Thu, 24 Sep 2020 13:38:42 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kent Gibson <warthog618@...il.com>
Cc:     linux-gpio@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 9/9] gpio: mockup: refactor the module init function

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

Let's move the code preparing the device properties into a separate
routine. This has the advantage of simplifying the error handling and
makes the indentation less deep.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/gpio/gpio-mockup.c | 96 +++++++++++++++++++-------------------
 1 file changed, 49 insertions(+), 47 deletions(-)

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index c35fd05de395..e2285f4330dd 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -503,16 +503,59 @@ static __init char **gpio_mockup_make_line_names(const char *label,
 	return names;
 }
 
-static int __init gpio_mockup_init(void)
+static int __init gpio_mockup_register_chip(int idx)
 {
 	struct property_entry properties[GPIO_MOCKUP_MAX_PROP];
-	int i, prop, num_chips, err = 0, base;
 	struct platform_device_info pdevinfo;
 	struct platform_device *pdev;
+	char **line_names = NULL;
 	char chip_label[32];
-	char **line_names;
+	int prop = 0, base;
 	u16 ngpio;
 
+	memset(properties, 0, sizeof(properties));
+	memset(&pdevinfo, 0, sizeof(pdevinfo));
+
+	snprintf(chip_label, sizeof(chip_label), "gpio-mockup-%c", idx + 'A');
+	properties[prop++] = PROPERTY_ENTRY_STRING("chip-label", chip_label);
+
+	base = gpio_mockup_range_base(idx);
+	if (base >= 0)
+		properties[prop++] = PROPERTY_ENTRY_U32("gpio-base", base);
+
+	ngpio = base < 0 ? gpio_mockup_range_ngpio(idx)
+			 : gpio_mockup_range_ngpio(idx) - base;
+	properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio);
+
+	if (gpio_mockup_named_lines) {
+		line_names = gpio_mockup_make_line_names(chip_label, ngpio);
+		if (!line_names)
+			return -ENOMEM;
+
+		properties[prop++] = PROPERTY_ENTRY_STRING_ARRAY_LEN(
+					"gpio-line-names", line_names, ngpio);
+	}
+
+	pdevinfo.name = "gpio-mockup";
+	pdevinfo.id = idx;
+	pdevinfo.properties = properties;
+
+	pdev = platform_device_register_full(&pdevinfo);
+	kfree_strarray(line_names, line_names ? ngpio : 0);
+	if (IS_ERR(pdev)) {
+		pr_err("error registering device");
+		return PTR_ERR(pdev);
+	}
+
+	gpio_mockup_pdevs[idx] = pdev;
+
+	return 0;
+}
+
+static int __init gpio_mockup_init(void)
+{
+	int i, num_chips, err;
+
 	if ((gpio_mockup_num_ranges < 2) ||
 	    (gpio_mockup_num_ranges % 2) ||
 	    (gpio_mockup_num_ranges > GPIO_MOCKUP_MAX_RANGES))
@@ -540,54 +583,13 @@ static int __init gpio_mockup_init(void)
 	}
 
 	for (i = 0; i < num_chips; i++) {
-		memset(properties, 0, sizeof(properties));
-		memset(&pdevinfo, 0, sizeof(pdevinfo));
-		prop = 0;
-		line_names = NULL;
-
-		snprintf(chip_label, sizeof(chip_label),
-			 "gpio-mockup-%c", i + 'A');
-		properties[prop++] = PROPERTY_ENTRY_STRING("chip-label",
-							   chip_label);
-
-		base = gpio_mockup_range_base(i);
-		if (base >= 0)
-			properties[prop++] = PROPERTY_ENTRY_U32("gpio-base",
-								base);
-
-		ngpio = base < 0 ? gpio_mockup_range_ngpio(i)
-				 : gpio_mockup_range_ngpio(i) - base;
-		properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio);
-
-		if (gpio_mockup_named_lines) {
-			line_names = gpio_mockup_make_line_names(chip_label,
-								 ngpio);
-			if (!line_names) {
-				platform_driver_unregister(&gpio_mockup_driver);
-				gpio_mockup_unregister_pdevs();
-				return -ENOMEM;
-			}
-
-			properties[prop++] = PROPERTY_ENTRY_STRING_ARRAY_LEN(
-						"gpio-line-names",
-						line_names, ngpio);
-		}
-
-		pdevinfo.name = "gpio-mockup";
-		pdevinfo.id = i;
-		pdevinfo.properties = properties;
-
-		pdev = platform_device_register_full(&pdevinfo);
-		kfree_strarray(line_names, line_names ? ngpio : 0);
-		if (IS_ERR(pdev)) {
-			pr_err("error registering device");
+		err = gpio_mockup_register_chip(i);
+		if (err) {
 			platform_driver_unregister(&gpio_mockup_driver);
 			gpio_mockup_unregister_pdevs();
 			debugfs_remove_recursive(gpio_mockup_dbg_dir);
-			return PTR_ERR(pdev);
+			return err;
 		}
-
-		gpio_mockup_pdevs[i] = pdev;
 	}
 
 	return 0;
-- 
2.26.1