linux-kernel - [PATCH 01/22] watchdog: tegra_wdt: Use watchdog_stop_on

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Date:   Wed, 10 Apr 2019 09:27:42 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Subject: [PATCH 01/22] watchdog: tegra_wdt: Use watchdog_stop_on_unregister and other improvements

Use watchdog_stop_on_unregister() in probe instead of calling
tegra_wdt_stop() in the remove function. Also introduce local variable
'struct device *dev' and use it instead of dereferencing it repeatedly.
Finally, drop the now empty remove function.

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

Cc: Thierry Reding <thierry.reding@...il.com>
Cc: Jonathan Hunter <jonathanh@...dia.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/watchdog/tegra_wdt.c | 26 +++++++-------------------
 1 file changed, 7 insertions(+), 19 deletions(-)

diff --git a/drivers/watchdog/tegra_wdt.c b/drivers/watchdog/tegra_wdt.c
index fc3cf5edf6c7..a58b000acc4f 100644
--- a/drivers/watchdog/tegra_wdt.c
+++ b/drivers/watchdog/tegra_wdt.c
@@ -181,6 +181,7 @@ static const struct watchdog_ops tegra_wdt_ops = {
 
 static int tegra_wdt_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	struct watchdog_device *wdd;
 	struct tegra_wdt *wdt;
 	void __iomem *regs;
@@ -195,7 +196,7 @@ static int tegra_wdt_probe(struct platform_device *pdev)
 	 * Allocate our watchdog driver data, which has the
 	 * struct watchdog_device nested within it.
 	 */
-	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
+	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
 	if (!wdt)
 		return -ENOMEM;
 
@@ -210,39 +211,27 @@ static int tegra_wdt_probe(struct platform_device *pdev)
 	wdd->ops = &tegra_wdt_ops;
 	wdd->min_timeout = MIN_WDT_TIMEOUT;
 	wdd->max_timeout = MAX_WDT_TIMEOUT;
-	wdd->parent = &pdev->dev;
+	wdd->parent = dev;
 
 	watchdog_set_drvdata(wdd, wdt);
 
 	watchdog_set_nowayout(wdd, nowayout);
 
-	ret = devm_watchdog_register_device(&pdev->dev, wdd);
+	watchdog_stop_on_unregister(wdd);
+	ret = devm_watchdog_register_device(dev, wdd);
 	if (ret) {
-		dev_err(&pdev->dev,
-			"failed to register watchdog device\n");
+		dev_err(dev, "failed to register watchdog device\n");
 		return ret;
 	}
 
 	platform_set_drvdata(pdev, wdt);
 
-	dev_info(&pdev->dev,
-		 "initialized (heartbeat = %d sec, nowayout = %d)\n",
+	dev_info(dev, "initialized (heartbeat = %d sec, nowayout = %d)\n",
 		 heartbeat, nowayout);
 
 	return 0;
 }
 
-static int tegra_wdt_remove(struct platform_device *pdev)
-{
-	struct tegra_wdt *wdt = platform_get_drvdata(pdev);
-
-	tegra_wdt_stop(&wdt->wdd);
-
-	dev_info(&pdev->dev, "removed wdt\n");
-
-	return 0;
-}
-
 #ifdef CONFIG_PM_SLEEP
 static int tegra_wdt_runtime_suspend(struct device *dev)
 {
@@ -278,7 +267,6 @@ static const struct dev_pm_ops tegra_wdt_pm_ops = {
 
 static struct platform_driver tegra_wdt_driver = {
 	.probe		= tegra_wdt_probe,
-	.remove		= tegra_wdt_remove,
 	.driver		= {
 		.name	= "tegra-wdt",
 		.pm	= &tegra_wdt_pm_ops,
-- 
2.7.4