From 1678f83095c27c145ffaaaaf5f09187ed747d731 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Tue, 9 Apr 2019 10:23:42 -0700 Subject: [PATCH] watchdog: meson_gxbb_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 - Replace shutdown function with call to watchdog_stop_on_reboot() Cc: Kevin Hilman Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/meson_gxbb_wdt.c | 45 +++++++++++-------------------- 1 file changed, 15 insertions(+), 30 deletions(-) diff --git a/drivers/watchdog/meson_gxbb_wdt.c b/drivers/watchdog/meson_gxbb_wdt.c index a8ed75cc9a6e..d17c1a6ed723 100644 --- a/drivers/watchdog/meson_gxbb_wdt.c +++ b/drivers/watchdog/meson_gxbb_wdt.c @@ -136,12 +136,18 @@ static const struct of_device_id meson_gxbb_wdt_dt_ids[] = { }; MODULE_DEVICE_TABLE(of, meson_gxbb_wdt_dt_ids); +static void meson_clk_disable_unprepare(void *data) +{ + clk_disable_unprepare(data); +} + static int meson_gxbb_wdt_probe(struct platform_device *pdev) { + struct device *dev = &pdev->dev; struct meson_gxbb_wdt *data; int ret; - data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; @@ -149,17 +155,21 @@ static int meson_gxbb_wdt_probe(struct platform_device *pdev) if (IS_ERR(data->reg_base)) return PTR_ERR(data->reg_base); - data->clk = devm_clk_get(&pdev->dev, NULL); + data->clk = devm_clk_get(dev, NULL); if (IS_ERR(data->clk)) return PTR_ERR(data->clk); ret = clk_prepare_enable(data->clk); if (ret) return ret; + ret = devm_add_action_or_reset(dev, meson_clk_disable_unprepare, + data->clk); + if (ret) + return ret; platform_set_drvdata(pdev, data); - data->wdt_dev.parent = &pdev->dev; + data->wdt_dev.parent = dev; data->wdt_dev.info = &meson_gxbb_wdt_info; data->wdt_dev.ops = &meson_gxbb_wdt_ops; data->wdt_dev.max_hw_heartbeat_ms = GXBB_WDT_TCNT_SETUP_MASK; @@ -176,37 +186,12 @@ static int meson_gxbb_wdt_probe(struct platform_device *pdev) meson_gxbb_wdt_set_timeout(&data->wdt_dev, data->wdt_dev.timeout); - ret = watchdog_register_device(&data->wdt_dev); - if (ret) { - clk_disable_unprepare(data->clk); - return ret; - } - - return 0; -} - -static int meson_gxbb_wdt_remove(struct platform_device *pdev) -{ - struct meson_gxbb_wdt *data = platform_get_drvdata(pdev); - - watchdog_unregister_device(&data->wdt_dev); - - clk_disable_unprepare(data->clk); - - return 0; -} - -static void meson_gxbb_wdt_shutdown(struct platform_device *pdev) -{ - struct meson_gxbb_wdt *data = platform_get_drvdata(pdev); - - meson_gxbb_wdt_stop(&data->wdt_dev); + watchdog_stop_on_reboot(&data->wdt_dev); + return devm_watchdog_register_device(dev, &data->wdt_dev); } static struct platform_driver meson_gxbb_wdt_driver = { .probe = meson_gxbb_wdt_probe, - .remove = meson_gxbb_wdt_remove, - .shutdown = meson_gxbb_wdt_shutdown, .driver = { .name = "meson-gxbb-wdt", .pm = &meson_gxbb_wdt_pm_ops,