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Subject[PATCH 9/9] gpio: mockup: refactor the module init function
Date
From: Bartosz Golaszewski <bgolaszewski@baylibre.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@baylibre.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
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