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authorGuenter Roeck <linux@roeck-us.net>2019-04-10 09:27:58 -0700
committerWim Van Sebroeck <wim@linux-watchdog.org>2019-05-05 21:02:36 +0200
commitfd56d6c9a2ed2b82ceb24cf309482d232ad12b67 (patch)
tree0104c174ddecf5b778ef8414b2f45617a99dd3bf /drivers/watchdog
parent1f22b8ca6b26e47ebbd5d0c9991207fe94c4b8db (diff)
downloadlinux-fd56d6c9a2ed2b82ceb24cf309482d232ad12b67.tar.bz2
watchdog: loongson1_wdt: Convert to use device managed functions and other improvements
Use device managed functions to simplify error handling, reduce source code size, improve readability, and reduce the likelyhood of bugs. Other improvements as listed below. 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 - Drop assignments to otherwise unused variables - Drop unnecessary braces around conditional return statements - Drop empty remove function - Use devm_add_action_or_reset() for calls to clk_disable_unprepare - Introduce local variable 'struct device *dev' and use it instead of dereferencing it repeatedly - Use devm_watchdog_register_driver() to register watchdog device Cc: Keguang Zhang <keguang.zhang@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/loongson1_wdt.c48
1 files changed, 21 insertions, 27 deletions
diff --git a/drivers/watchdog/loongson1_wdt.c b/drivers/watchdog/loongson1_wdt.c
index 1119634b5c87..d8075e2affa7 100644
--- a/drivers/watchdog/loongson1_wdt.c
+++ b/drivers/watchdog/loongson1_wdt.c
@@ -83,14 +83,20 @@ static const struct watchdog_ops ls1x_wdt_ops = {
.set_timeout = ls1x_wdt_set_timeout,
};
+static void ls1x_clk_disable_unprepare(void *data)
+{
+ clk_disable_unprepare(data);
+}
+
static int ls1x_wdt_probe(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
struct ls1x_wdt_drvdata *drvdata;
struct watchdog_device *ls1x_wdt;
unsigned long clk_rate;
int err;
- drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+ drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
@@ -98,21 +104,23 @@ static int ls1x_wdt_probe(struct platform_device *pdev)
if (IS_ERR(drvdata->base))
return PTR_ERR(drvdata->base);
- drvdata->clk = devm_clk_get(&pdev->dev, pdev->name);
+ drvdata->clk = devm_clk_get(dev, pdev->name);
if (IS_ERR(drvdata->clk))
return PTR_ERR(drvdata->clk);
err = clk_prepare_enable(drvdata->clk);
if (err) {
- dev_err(&pdev->dev, "clk enable failed\n");
+ dev_err(dev, "clk enable failed\n");
return err;
}
+ err = devm_add_action_or_reset(dev, ls1x_clk_disable_unprepare,
+ drvdata->clk);
+ if (err)
+ return err;
clk_rate = clk_get_rate(drvdata->clk);
- if (!clk_rate) {
- err = -EINVAL;
- goto err0;
- }
+ if (!clk_rate)
+ return -EINVAL;
drvdata->clk_rate = clk_rate;
ls1x_wdt = &drvdata->wdt;
@@ -121,41 +129,27 @@ static int ls1x_wdt_probe(struct platform_device *pdev)
ls1x_wdt->timeout = DEFAULT_HEARTBEAT;
ls1x_wdt->min_timeout = 1;
ls1x_wdt->max_hw_heartbeat_ms = U32_MAX / clk_rate * 1000;
- ls1x_wdt->parent = &pdev->dev;
+ ls1x_wdt->parent = dev;
- watchdog_init_timeout(ls1x_wdt, heartbeat, &pdev->dev);
+ watchdog_init_timeout(ls1x_wdt, heartbeat, dev);
watchdog_set_nowayout(ls1x_wdt, nowayout);
watchdog_set_drvdata(ls1x_wdt, drvdata);
- err = watchdog_register_device(&drvdata->wdt);
+ err = devm_watchdog_register_device(dev, &drvdata->wdt);
if (err) {
- dev_err(&pdev->dev, "failed to register watchdog device\n");
- goto err0;
+ dev_err(dev, "failed to register watchdog device\n");
+ return err;
}
platform_set_drvdata(pdev, drvdata);
- dev_info(&pdev->dev, "Loongson1 Watchdog driver registered\n");
-
- return 0;
-err0:
- clk_disable_unprepare(drvdata->clk);
- return err;
-}
-
-static int ls1x_wdt_remove(struct platform_device *pdev)
-{
- struct ls1x_wdt_drvdata *drvdata = platform_get_drvdata(pdev);
-
- watchdog_unregister_device(&drvdata->wdt);
- clk_disable_unprepare(drvdata->clk);
+ dev_info(dev, "Loongson1 Watchdog driver registered\n");
return 0;
}
static struct platform_driver ls1x_wdt_driver = {
.probe = ls1x_wdt_probe,
- .remove = ls1x_wdt_remove,
.driver = {
.name = "ls1x-wdt",
},