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watchdog: wm831x_wdt: Convert to use device managed functions 

Use device managed functions to simplify error handling, reduce
source code size, improve readability, and reduce the likelyhood of bugs.

The conversion was done automatically with coccinelle using the
following semantic patches. The semantic patches and the scripts used
to generate this commit log are available at
https://github.com/groeck/coccinelle-patches

- Replace 'goto l; ... l: return e;' with 'return e;'
- Replace 'val = e; return val;' with 'return e;'
- Drop assignments to otherwise unused variables
- Replace 'if (e) { return expr; }' with 'if (e) return expr;'
- Drop remove function
- Drop platform_set_drvdata()
- Use devm_watchdog_register_driver() to register watchdog device

Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2017-01-10 15:22:01 -08:00
parent dd36f6ce68
commit 30cba9a109
1 changed files with 7 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/watchdog/wm831x_wdt.c
View File

@ -194,7 +194,7 @@ static int wm831x_wdt_probe(struct platform_device *pdev)
if (ret < 0) {
dev_err(wm831x->dev, "Failed to read watchdog status: %d\n",
ret);
goto err;
return ret;
}
reg = ret;
@ -203,10 +203,8 @@ static int wm831x_wdt_probe(struct platform_device *pdev)
driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data),
GFP_KERNEL);
if (!driver_data) {
ret = -ENOMEM;
goto err;
}
if (!driver_data)
return -ENOMEM;
mutex_init(&driver_data->lock);
driver_data->wm831x = wm831x;
@ -253,7 +251,7 @@ static int wm831x_wdt_probe(struct platform_device *pdev)
dev_err(wm831x->dev,
"Failed to request update GPIO: %d\n",
ret);
goto err;
return ret;
}
driver_data->update_gpio = pdata->update_gpio;
@ -269,37 +267,22 @@ static int wm831x_wdt_probe(struct platform_device *pdev)
} else {
dev_err(wm831x->dev,
"Failed to unlock security key: %d\n", ret);
goto err;
return ret;
}
}
ret = watchdog_register_device(&driver_data->wdt);
ret = devm_watchdog_register_device(&pdev->dev, &driver_data->wdt);
if (ret != 0) {
dev_err(wm831x->dev, "watchdog_register_device() failed: %d\n",
ret);
goto err;
return ret;
}
platform_set_drvdata(pdev, driver_data);
return 0;
err:
return ret;
}
static int wm831x_wdt_remove(struct platform_device *pdev)
{
struct wm831x_wdt_drvdata *driver_data = platform_get_drvdata(pdev);
watchdog_unregister_device(&driver_data->wdt);
return 0;
}
static struct platform_driver wm831x_wdt_driver = {
.probe = wm831x_wdt_probe,
.remove = wm831x_wdt_remove,
.driver = {
.name = "wm831x-watchdog",
},