From 1f53305877fae6089c81dbce8109df02e6b2e26e Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Wed, 10 Apr 2019 09:27:54 -0700 Subject: [PATCH] watchdog: stm32_iwdg: 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 - 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: Maxime Coquelin Cc: Alexandre Torgue Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/stm32_iwdg.c | 65 +++++++++++++++++++++---------------------- 1 file changed, 31 insertions(+), 34 deletions(-) diff --git a/drivers/watchdog/stm32_iwdg.c b/drivers/watchdog/stm32_iwdg.c index 309563e..68756a4 100644 --- a/drivers/watchdog/stm32_iwdg.c +++ b/drivers/watchdog/stm32_iwdg.c @@ -138,38 +138,52 @@ static int stm32_iwdg_set_timeout(struct watchdog_device *wdd, return 0; } +static void stm32_clk_disable_unprepare(void *data) +{ + clk_disable_unprepare(data); +} + static int stm32_iwdg_clk_init(struct platform_device *pdev, struct stm32_iwdg *wdt) { + struct device *dev = &pdev->dev; u32 ret; - wdt->clk_lsi = devm_clk_get(&pdev->dev, "lsi"); + wdt->clk_lsi = devm_clk_get(dev, "lsi"); if (IS_ERR(wdt->clk_lsi)) { - dev_err(&pdev->dev, "Unable to get lsi clock\n"); + dev_err(dev, "Unable to get lsi clock\n"); return PTR_ERR(wdt->clk_lsi); } /* optional peripheral clock */ if (wdt->has_pclk) { - wdt->clk_pclk = devm_clk_get(&pdev->dev, "pclk"); + wdt->clk_pclk = devm_clk_get(dev, "pclk"); if (IS_ERR(wdt->clk_pclk)) { - dev_err(&pdev->dev, "Unable to get pclk clock\n"); + dev_err(dev, "Unable to get pclk clock\n"); return PTR_ERR(wdt->clk_pclk); } ret = clk_prepare_enable(wdt->clk_pclk); if (ret) { - dev_err(&pdev->dev, "Unable to prepare pclk clock\n"); + dev_err(dev, "Unable to prepare pclk clock\n"); return ret; } + ret = devm_add_action_or_reset(dev, + stm32_clk_disable_unprepare, + wdt->clk_pclk); + if (ret) + return ret; } ret = clk_prepare_enable(wdt->clk_lsi); if (ret) { - dev_err(&pdev->dev, "Unable to prepare lsi clock\n"); - clk_disable_unprepare(wdt->clk_pclk); + dev_err(dev, "Unable to prepare lsi clock\n"); return ret; } + ret = devm_add_action_or_reset(dev, stm32_clk_disable_unprepare, + wdt->clk_lsi); + if (ret) + return ret; wdt->rate = clk_get_rate(wdt->clk_lsi); @@ -199,16 +213,17 @@ MODULE_DEVICE_TABLE(of, stm32_iwdg_of_match); static int stm32_iwdg_probe(struct platform_device *pdev) { + struct device *dev = &pdev->dev; struct watchdog_device *wdd; const struct of_device_id *match; struct stm32_iwdg *wdt; int ret; - match = of_match_device(stm32_iwdg_of_match, &pdev->dev); + match = of_match_device(stm32_iwdg_of_match, dev); if (!match) return -ENODEV; - wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); + wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); if (!wdt) return -ENOMEM; @@ -217,7 +232,7 @@ static int stm32_iwdg_probe(struct platform_device *pdev) /* This is the timer base. */ wdt->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(wdt->regs)) { - dev_err(&pdev->dev, "Could not get resource\n"); + dev_err(dev, "Could not get resource\n"); return PTR_ERR(wdt->regs); } @@ -231,46 +246,28 @@ static int stm32_iwdg_probe(struct platform_device *pdev) wdd->ops = &stm32_iwdg_ops; wdd->min_timeout = ((RLR_MIN + 1) * 256) / wdt->rate; wdd->max_hw_heartbeat_ms = ((RLR_MAX + 1) * 256 * 1000) / wdt->rate; - wdd->parent = &pdev->dev; + wdd->parent = dev; watchdog_set_drvdata(wdd, wdt); watchdog_set_nowayout(wdd, WATCHDOG_NOWAYOUT); - ret = watchdog_init_timeout(wdd, 0, &pdev->dev); + ret = watchdog_init_timeout(wdd, 0, dev); if (ret) - dev_warn(&pdev->dev, - "unable to set timeout value, using default\n"); + dev_warn(dev, "unable to set timeout value, using default\n"); - ret = watchdog_register_device(wdd); + ret = devm_watchdog_register_device(dev, wdd); if (ret) { - dev_err(&pdev->dev, "failed to register watchdog device\n"); - goto err; + dev_err(dev, "failed to register watchdog device\n"); + return ret; } platform_set_drvdata(pdev, wdt); return 0; -err: - clk_disable_unprepare(wdt->clk_lsi); - clk_disable_unprepare(wdt->clk_pclk); - - return ret; -} - -static int stm32_iwdg_remove(struct platform_device *pdev) -{ - struct stm32_iwdg *wdt = platform_get_drvdata(pdev); - - watchdog_unregister_device(&wdt->wdd); - clk_disable_unprepare(wdt->clk_lsi); - clk_disable_unprepare(wdt->clk_pclk); - - return 0; } static struct platform_driver stm32_iwdg_driver = { .probe = stm32_iwdg_probe, - .remove = stm32_iwdg_remove, .driver = { .name = "iwdg", .of_match_table = of_match_ptr(stm32_iwdg_of_match), -- 2.7.4