From dcc3ce0b7d010be7b092f0c3ce26e6c35bb39bbb Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Tue, 9 Apr 2019 10:23:54 -0700 Subject: [PATCH] watchdog: sama5d4_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 empty remove function - Introduce local variable 'struct device *dev' and use it instead of dereferencing it repeatedly - Replace stop on remove with call to watchdog_stop_on_unregister() - Use devm_watchdog_register_driver() to register watchdog device Cc: Nicolas Ferre Cc: Alexandre Belloni Cc: Ludovic Desroches Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/sama5d4_wdt.c | 35 ++++++++++++---------------------- 1 file changed, 12 insertions(+), 23 deletions(-) diff --git a/drivers/watchdog/sama5d4_wdt.c b/drivers/watchdog/sama5d4_wdt.c index ea72fa0aa3ec..111695223aae 100644 --- a/drivers/watchdog/sama5d4_wdt.c +++ b/drivers/watchdog/sama5d4_wdt.c @@ -199,6 +199,7 @@ static int sama5d4_wdt_init(struct sama5d4_wdt *wdt) static int sama5d4_wdt_probe(struct platform_device *pdev) { + struct device *dev = &pdev->dev; struct watchdog_device *wdd; struct sama5d4_wdt *wdt; void __iomem *regs; @@ -206,7 +207,7 @@ static int sama5d4_wdt_probe(struct platform_device *pdev) u32 timeout; int ret; - wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); + wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); if (!wdt) return -ENOMEM; @@ -226,26 +227,25 @@ static int sama5d4_wdt_probe(struct platform_device *pdev) wdt->reg_base = regs; - irq = irq_of_parse_and_map(pdev->dev.of_node, 0); + irq = irq_of_parse_and_map(dev->of_node, 0); if (!irq) - dev_warn(&pdev->dev, "failed to get IRQ from DT\n"); + dev_warn(dev, "failed to get IRQ from DT\n"); - ret = of_sama5d4_wdt_init(pdev->dev.of_node, wdt); + ret = of_sama5d4_wdt_init(dev->of_node, wdt); if (ret) return ret; if ((wdt->mr & AT91_WDT_WDFIEN) && irq) { - ret = devm_request_irq(&pdev->dev, irq, sama5d4_wdt_irq_handler, + ret = devm_request_irq(dev, irq, sama5d4_wdt_irq_handler, IRQF_SHARED | IRQF_IRQPOLL | IRQF_NO_SUSPEND, pdev->name, pdev); if (ret) { - dev_err(&pdev->dev, - "cannot register interrupt handler\n"); + dev_err(dev, "cannot register interrupt handler\n"); return ret; } } - watchdog_init_timeout(wdd, wdt_timeout, &pdev->dev); + watchdog_init_timeout(wdd, wdt_timeout, dev); timeout = WDT_SEC2TICKS(wdd->timeout); @@ -258,31 +258,21 @@ static int sama5d4_wdt_probe(struct platform_device *pdev) watchdog_set_nowayout(wdd, nowayout); - ret = watchdog_register_device(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 (timeout = %d sec, nowayout = %d)\n", + dev_info(dev, "initialized (timeout = %d sec, nowayout = %d)\n", wdd->timeout, nowayout); return 0; } -static int sama5d4_wdt_remove(struct platform_device *pdev) -{ - struct sama5d4_wdt *wdt = platform_get_drvdata(pdev); - - sama5d4_wdt_stop(&wdt->wdd); - - watchdog_unregister_device(&wdt->wdd); - - return 0; -} - static const struct of_device_id sama5d4_wdt_of_match[] = { { .compatible = "atmel,sama5d4-wdt", }, { } @@ -310,7 +300,6 @@ static SIMPLE_DEV_PM_OPS(sama5d4_wdt_pm_ops, NULL, static struct platform_driver sama5d4_wdt_driver = { .probe = sama5d4_wdt_probe, - .remove = sama5d4_wdt_remove, .driver = { .name = "sama5d4_wdt", .pm = &sama5d4_wdt_pm_ops, -- 2.30.2