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[5/5] PM / devfreq: sun8i-a33-mbus: Convert to platform remove callback returning void

Message ID 0ca3f35bdf9549ccda7c6c10a476f28350d987df.1709587301.git.u.kleine-koenig@pengutronix.de (mailing list archive)
State New
Delegated to: Chanwoo Choi
Headers show
Series PM / devfreq: Convert to platform remove callback returning void | expand

Commit Message

Uwe Kleine-König March 4, 2024, 9:28 p.m. UTC
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/devfreq/sun8i-a33-mbus.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

Comments

Jernej Škrabec March 4, 2024, 9:32 p.m. UTC | #1
Dne ponedeljek, 04. marec 2024 ob 22:28:43 CET je Uwe Kleine-König napisal(a):
> The .remove() callback for a platform driver returns an int which makes
> many driver authors wrongly assume it's possible to do error handling by
> returning an error code. However the value returned is ignored (apart
> from emitting a warning) and this typically results in resource leaks.
> 
> To improve here there is a quest to make the remove callback return
> void. In the first step of this quest all drivers are converted to
> .remove_new(), which already returns void. Eventually after all drivers
> are converted, .remove_new() will be renamed to .remove().
> 
> Trivially convert this driver from always returning zero in the remove
> callback to the void returning variant.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

> ---
>  drivers/devfreq/sun8i-a33-mbus.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/devfreq/sun8i-a33-mbus.c b/drivers/devfreq/sun8i-a33-mbus.c
> index 13d32213139f..bcf654f4ff96 100644
> --- a/drivers/devfreq/sun8i-a33-mbus.c
> +++ b/drivers/devfreq/sun8i-a33-mbus.c
> @@ -458,7 +458,7 @@ static int sun8i_a33_mbus_probe(struct platform_device *pdev)
>  	return dev_err_probe(dev, ret, err);
>  }
>  
> -static int sun8i_a33_mbus_remove(struct platform_device *pdev)
> +static void sun8i_a33_mbus_remove(struct platform_device *pdev)
>  {
>  	struct sun8i_a33_mbus *priv = platform_get_drvdata(pdev);
>  	unsigned long initial_freq = priv->profile.initial_freq;
> @@ -475,8 +475,6 @@ static int sun8i_a33_mbus_remove(struct platform_device *pdev)
>  	clk_rate_exclusive_put(priv->clk_mbus);
>  	clk_rate_exclusive_put(priv->clk_dram);
>  	clk_disable_unprepare(priv->clk_bus);
> -
> -	return 0;
>  }
>  
>  static const struct sun8i_a33_mbus_variant sun50i_a64_mbus = {
> @@ -497,7 +495,7 @@ static SIMPLE_DEV_PM_OPS(sun8i_a33_mbus_pm_ops,
>  
>  static struct platform_driver sun8i_a33_mbus_driver = {
>  	.probe	= sun8i_a33_mbus_probe,
> -	.remove	= sun8i_a33_mbus_remove,
> +	.remove_new = sun8i_a33_mbus_remove,
>  	.driver	= {
>  		.name		= "sun8i-a33-mbus",
>  		.of_match_table	= sun8i_a33_mbus_of_match,
>
diff mbox series

Patch

diff --git a/drivers/devfreq/sun8i-a33-mbus.c b/drivers/devfreq/sun8i-a33-mbus.c
index 13d32213139f..bcf654f4ff96 100644
--- a/drivers/devfreq/sun8i-a33-mbus.c
+++ b/drivers/devfreq/sun8i-a33-mbus.c
@@ -458,7 +458,7 @@  static int sun8i_a33_mbus_probe(struct platform_device *pdev)
 	return dev_err_probe(dev, ret, err);
 }
 
-static int sun8i_a33_mbus_remove(struct platform_device *pdev)
+static void sun8i_a33_mbus_remove(struct platform_device *pdev)
 {
 	struct sun8i_a33_mbus *priv = platform_get_drvdata(pdev);
 	unsigned long initial_freq = priv->profile.initial_freq;
@@ -475,8 +475,6 @@  static int sun8i_a33_mbus_remove(struct platform_device *pdev)
 	clk_rate_exclusive_put(priv->clk_mbus);
 	clk_rate_exclusive_put(priv->clk_dram);
 	clk_disable_unprepare(priv->clk_bus);
-
-	return 0;
 }
 
 static const struct sun8i_a33_mbus_variant sun50i_a64_mbus = {
@@ -497,7 +495,7 @@  static SIMPLE_DEV_PM_OPS(sun8i_a33_mbus_pm_ops,
 
 static struct platform_driver sun8i_a33_mbus_driver = {
 	.probe	= sun8i_a33_mbus_probe,
-	.remove	= sun8i_a33_mbus_remove,
+	.remove_new = sun8i_a33_mbus_remove,
 	.driver	= {
 		.name		= "sun8i-a33-mbus",
 		.of_match_table	= sun8i_a33_mbus_of_match,