Re: [PATCH 2/7] watchdog: jz4740: Use devm_* functions

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On 12/28/2017 08:29 AM, Paul Cercueil wrote:
- Use devm_clk_get instead of clk_get
- Use devm_watchdog_register_device instead of watchdog_register_device

Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
---
  drivers/watchdog/jz4740_wdt.c | 27 ++++++++-------------------
  1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
index 6955deb100ef..92d6ca8ceb49 100644
--- a/drivers/watchdog/jz4740_wdt.c
+++ b/drivers/watchdog/jz4740_wdt.c
@@ -178,40 +178,29 @@ static int jz4740_wdt_probe(struct platform_device *pdev)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	drvdata->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(drvdata->base)) {
-		ret = PTR_ERR(drvdata->base);
-		goto err_out;
-	}
+	if (IS_ERR(drvdata->base))
+		return PTR_ERR(drvdata->base);
- drvdata->rtc_clk = clk_get(&pdev->dev, "rtc");
+	drvdata->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
  	if (IS_ERR(drvdata->rtc_clk)) {
  		dev_err(&pdev->dev, "cannot find RTC clock\n");
-		ret = PTR_ERR(drvdata->rtc_clk);
-		goto err_out;
+		return PTR_ERR(drvdata->rtc_clk);
  	}
- ret = watchdog_register_device(&drvdata->wdt);
+	ret = devm_watchdog_register_device(&pdev->dev, &drvdata->wdt);
  	if (ret < 0)
-		goto err_disable_clk;
+		return ret;
platform_set_drvdata(pdev, drvdata);
-	return 0;
-err_disable_clk:
-	clk_put(drvdata->rtc_clk);
-err_out:
-	return ret;
+	return 0;
  }
static int jz4740_wdt_remove(struct platform_device *pdev)
  {
  	struct jz4740_wdt_drvdata *drvdata = platform_get_drvdata(pdev);
- jz4740_wdt_stop(&drvdata->wdt);
-	watchdog_unregister_device(&drvdata->wdt);
-	clk_put(drvdata->rtc_clk);
-
-	return 0;
+	return jz4740_wdt_stop(&drvdata->wdt);

If the watchdog is running, the module can not be unloaded. Even if that wasn't
the case, this defeats both WDIOF_MAGICCLOSE and watchdog_set_nowayout().
Are you sure this is what you want ? If so, please call
watchdog_stop_on_unregister() before registration; this clarifies that this
is what you want, and you can drop the remove function.

Thanks,
Guenter

  }
static struct platform_driver jz4740_wdt_driver = {


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