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From: Guenter Roeck <linux@roeck-us.net>
To: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org,
	Guenter Roeck <linux@roeck-us.net>,
	Patrice Chotard <patrice.chotard@st.com>
Subject: [PATCH 19/23] watchdog: st_lpc_wdt: Convert to use device managed functions
Date: Tue,  9 Apr 2019 10:23:57 -0700
Message-ID: <1554830641-9247-20-git-send-email-linux@roeck-us.net> (raw)
In-Reply-To: <1554830641-9247-1-git-send-email-linux@roeck-us.net>

Use device managed functions to simplify error handling, reduce
source code size, improve readability, and reduce the likelyhood of bugs.

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

- 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: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/watchdog/st_lpc_wdt.c | 47 ++++++++++++++++++++++++-------------------
 1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/drivers/watchdog/st_lpc_wdt.c b/drivers/watchdog/st_lpc_wdt.c
index 196fb4b72c5d..9a5ed95c3403 100644
--- a/drivers/watchdog/st_lpc_wdt.c
+++ b/drivers/watchdog/st_lpc_wdt.c
@@ -142,10 +142,16 @@ static struct watchdog_device st_wdog_dev = {
 	.ops		= &st_wdog_ops,
 };
 
+static void st_clk_disable_unprepare(void *data)
+{
+	clk_disable_unprepare(data);
+}
+
 static int st_wdog_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	const struct of_device_id *match;
-	struct device_node *np = pdev->dev.of_node;
+	struct device_node *np = dev->of_node;
 	struct st_wdog *st_wdog;
 	struct regmap *regmap;
 	struct clk *clk;
@@ -155,7 +161,7 @@ static int st_wdog_probe(struct platform_device *pdev)
 
 	ret = of_property_read_u32(np, "st,lpc-mode", &mode);
 	if (ret) {
-		dev_err(&pdev->dev, "An LPC mode must be provided\n");
+		dev_err(dev, "An LPC mode must be provided\n");
 		return -EINVAL;
 	}
 
@@ -163,13 +169,13 @@ static int st_wdog_probe(struct platform_device *pdev)
 	if (mode != ST_LPC_MODE_WDT)
 		return -ENODEV;
 
-	st_wdog = devm_kzalloc(&pdev->dev, sizeof(*st_wdog), GFP_KERNEL);
+	st_wdog = devm_kzalloc(dev, sizeof(*st_wdog), GFP_KERNEL);
 	if (!st_wdog)
 		return -ENOMEM;
 
-	match = of_match_device(st_wdog_match, &pdev->dev);
+	match = of_match_device(st_wdog_match, dev);
 	if (!match) {
-		dev_err(&pdev->dev, "Couldn't match device\n");
+		dev_err(dev, "Couldn't match device\n");
 		return -ENODEV;
 	}
 	st_wdog->syscfg	= (struct st_wdog_syscfg *)match->data;
@@ -180,17 +186,17 @@ static int st_wdog_probe(struct platform_device *pdev)
 
 	regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
 	if (IS_ERR(regmap)) {
-		dev_err(&pdev->dev, "No syscfg phandle specified\n");
+		dev_err(dev, "No syscfg phandle specified\n");
 		return PTR_ERR(regmap);
 	}
 
-	clk = devm_clk_get(&pdev->dev, NULL);
+	clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(clk)) {
-		dev_err(&pdev->dev, "Unable to request clock\n");
+		dev_err(dev, "Unable to request clock\n");
 		return PTR_ERR(clk);
 	}
 
-	st_wdog->dev		= &pdev->dev;
+	st_wdog->dev		= dev;
 	st_wdog->base		= base;
 	st_wdog->clk		= clk;
 	st_wdog->regmap		= regmap;
@@ -198,39 +204,40 @@ static int st_wdog_probe(struct platform_device *pdev)
 	st_wdog->clkrate	= clk_get_rate(st_wdog->clk);
 
 	if (!st_wdog->clkrate) {
-		dev_err(&pdev->dev, "Unable to fetch clock rate\n");
+		dev_err(dev, "Unable to fetch clock rate\n");
 		return -EINVAL;
 	}
 	st_wdog_dev.max_timeout = 0xFFFFFFFF / st_wdog->clkrate;
-	st_wdog_dev.parent = &pdev->dev;
+	st_wdog_dev.parent = dev;
 
 	ret = clk_prepare_enable(clk);
 	if (ret) {
-		dev_err(&pdev->dev, "Unable to enable clock\n");
+		dev_err(dev, "Unable to enable clock\n");
 		return ret;
 	}
+	ret = devm_add_action_or_reset(dev, st_clk_disable_unprepare, clk);
+	if (ret)
+		return ret;
 
 	watchdog_set_drvdata(&st_wdog_dev, st_wdog);
 	watchdog_set_nowayout(&st_wdog_dev, WATCHDOG_NOWAYOUT);
 
 	/* Init Watchdog timeout with value in DT */
-	ret = watchdog_init_timeout(&st_wdog_dev, 0, &pdev->dev);
+	ret = watchdog_init_timeout(&st_wdog_dev, 0, dev);
 	if (ret) {
-		dev_err(&pdev->dev, "Unable to initialise watchdog timeout\n");
-		clk_disable_unprepare(clk);
+		dev_err(dev, "Unable to initialise watchdog timeout\n");
 		return ret;
 	}
 
-	ret = watchdog_register_device(&st_wdog_dev);
+	ret = devm_watchdog_register_device(dev, &st_wdog_dev);
 	if (ret) {
-		dev_err(&pdev->dev, "Unable to register watchdog\n");
-		clk_disable_unprepare(clk);
+		dev_err(dev, "Unable to register watchdog\n");
 		return ret;
 	}
 
 	st_wdog_setup(st_wdog, true);
 
-	dev_info(&pdev->dev, "LPC Watchdog driver registered, reset type is %s",
+	dev_info(dev, "LPC Watchdog driver registered, reset type is %s",
 		 st_wdog->warm_reset ? "warm" : "cold");
 
 	return ret;
@@ -241,8 +248,6 @@ static int st_wdog_remove(struct platform_device *pdev)
 	struct st_wdog *st_wdog = watchdog_get_drvdata(&st_wdog_dev);
 
 	st_wdog_setup(st_wdog, false);
-	watchdog_unregister_device(&st_wdog_dev);
-	clk_disable_unprepare(st_wdog->clk);
 
 	return 0;
 }
-- 
2.7.4


  parent reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-09 17:23 [PATCH 00/23] watchdog: Expand use of device managed functions (series 2 of 3) Guenter Roeck
2019-04-09 17:23 ` [PATCH 01/23] watchdog: max77620_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-09 17:23 ` [PATCH 02/23] watchdog: mena21_wdt: Use 'dev' instead of dereferencing it repeatedly Guenter Roeck
2019-04-11  7:18   ` Johannes Thumshirn
2019-04-09 17:23 ` [PATCH 03/23] watchdog: menf21bmc_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-09 17:23 ` [PATCH 04/23] watchdog: meson_gxbb_wdt: " Guenter Roeck
2019-04-09 17:23 ` [PATCH 05/23] watchdog: meson_wdt: Use 'dev' instead of dereferencing it repeatedly Guenter Roeck
2019-04-09 17:23 ` [PATCH 06/23] watchdog: mlx_wdt: " Guenter Roeck
2019-04-09 17:23 ` [PATCH 07/23] watchdog: moxart_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-09 17:23 ` [PATCH 08/23] watchdog: mtk_wdt: " Guenter Roeck
2019-04-09 17:23 ` [PATCH 09/23] watchdog: npcm_wdt: Use local variable 'dev' consistently Guenter Roeck
2019-04-09 17:23 ` [PATCH 10/23] watchdog: of_xilinx_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-10  6:38   ` Michal Simek
2019-04-10 12:09     ` Guenter Roeck
2019-04-09 17:23 ` [PATCH 11/23] watchdog: pm8916_wdt: Use 'dev' instead of dereferencing it repeatedly Guenter Roeck
2019-04-09 17:23 ` [PATCH 12/23] watchdog: qcom-wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-09 17:23 ` [PATCH 13/23] watchdog: rn5t618_wdt: Use 'dev' instead of dereferencing it repeatedly Guenter Roeck
2019-04-09 17:23 ` [PATCH 14/23] watchdog: rtd119x_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-09 17:23 ` [PATCH 15/23] watchdog: rza_wdt: Use 'dev' instead of dereferencing it repeatedly Guenter Roeck
2019-04-09 17:23 ` [PATCH 16/23] watchdog: sama5d4_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-09 17:23 ` [PATCH 17/23] watchdog: sirfsoc_wdt: " Guenter Roeck
2019-04-09 17:23 ` [PATCH 18/23] watchdog: 1: " Guenter Roeck
2019-04-09 17:38   ` Guenter Roeck
2019-04-09 17:23 ` Guenter Roeck [this message]
2019-04-10  7:26   ` [PATCH 19/23] watchdog: st_lpc_wdt: Convert to use device managed functions Patrice CHOTARD
2019-04-09 17:23 ` [PATCH 20/23] watchdog: stmp3xxx_rtc_wdt: " Guenter Roeck
2019-04-09 17:23 ` [PATCH 21/23] watchdog: stpmic1_wdt: Use 'dev' instead of dereferencing it repeatedly Guenter Roeck
2019-04-09 17:24 ` [PATCH 22/23] watchdog: sunxi_wdt: " Guenter Roeck
2019-04-10  7:06   ` Maxime Ripard
2019-04-09 17:24 ` [PATCH 23/23] watchdog: tangox_wdt: Convert to use device managed functions and other improvements Guenter Roeck
2019-04-10 11:20   ` Måns Rullgård

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