diff mbox series

[20/97] usb: dwc3-qcom: Convert to platform remove callback returning void

Message ID 20230517230239.187727-21-u.kleine-koenig@pengutronix.de (mailing list archive)
State Not Applicable
Headers show
Series usb: Convert to platform remove callback returning void | expand

Commit Message

Uwe Kleine-König May 17, 2023, 11:01 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() is
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/usb/dwc3/dwc3-qcom.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

Comments

Konrad Dybcio May 18, 2023, 9:57 a.m. UTC | #1
On 18.05.2023 01:01, Uwe Kleine-König wrote:
> 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() is
> 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>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>

Konrad
>  drivers/usb/dwc3/dwc3-qcom.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 959fc925ca7c..167f851c8e59 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -938,7 +938,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> -static int dwc3_qcom_remove(struct platform_device *pdev)
> +static void dwc3_qcom_remove(struct platform_device *pdev)
>  {
>  	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
>  	struct device *dev = &pdev->dev;
> @@ -958,8 +958,6 @@ static int dwc3_qcom_remove(struct platform_device *pdev)
>  
>  	pm_runtime_allow(dev);
>  	pm_runtime_disable(dev);
> -
> -	return 0;
>  }
>  
>  static int __maybe_unused dwc3_qcom_pm_suspend(struct device *dev)
> @@ -1052,7 +1050,7 @@ MODULE_DEVICE_TABLE(acpi, dwc3_qcom_acpi_match);
>  
>  static struct platform_driver dwc3_qcom_driver = {
>  	.probe		= dwc3_qcom_probe,
> -	.remove		= dwc3_qcom_remove,
> +	.remove_new	= dwc3_qcom_remove,
>  	.driver		= {
>  		.name	= "dwc3-qcom",
>  		.pm	= &dwc3_qcom_dev_pm_ops,
Thinh Nguyen May 23, 2023, 12:22 a.m. UTC | #2
On Thu, May 18, 2023, Uwe Kleine-König wrote:
> 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() is
> 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/usb/dwc3/dwc3-qcom.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 959fc925ca7c..167f851c8e59 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -938,7 +938,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> -static int dwc3_qcom_remove(struct platform_device *pdev)
> +static void dwc3_qcom_remove(struct platform_device *pdev)
>  {
>  	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
>  	struct device *dev = &pdev->dev;
> @@ -958,8 +958,6 @@ static int dwc3_qcom_remove(struct platform_device *pdev)
>  
>  	pm_runtime_allow(dev);
>  	pm_runtime_disable(dev);
> -
> -	return 0;
>  }
>  
>  static int __maybe_unused dwc3_qcom_pm_suspend(struct device *dev)
> @@ -1052,7 +1050,7 @@ MODULE_DEVICE_TABLE(acpi, dwc3_qcom_acpi_match);
>  
>  static struct platform_driver dwc3_qcom_driver = {
>  	.probe		= dwc3_qcom_probe,
> -	.remove		= dwc3_qcom_remove,
> +	.remove_new	= dwc3_qcom_remove,
>  	.driver		= {
>  		.name	= "dwc3-qcom",
>  		.pm	= &dwc3_qcom_dev_pm_ops,
> -- 
> 2.39.2
> 

Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>

Thanks,
Thinh
diff mbox series

Patch

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 959fc925ca7c..167f851c8e59 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -938,7 +938,7 @@  static int dwc3_qcom_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int dwc3_qcom_remove(struct platform_device *pdev)
+static void dwc3_qcom_remove(struct platform_device *pdev)
 {
 	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
 	struct device *dev = &pdev->dev;
@@ -958,8 +958,6 @@  static int dwc3_qcom_remove(struct platform_device *pdev)
 
 	pm_runtime_allow(dev);
 	pm_runtime_disable(dev);
-
-	return 0;
 }
 
 static int __maybe_unused dwc3_qcom_pm_suspend(struct device *dev)
@@ -1052,7 +1050,7 @@  MODULE_DEVICE_TABLE(acpi, dwc3_qcom_acpi_match);
 
 static struct platform_driver dwc3_qcom_driver = {
 	.probe		= dwc3_qcom_probe,
-	.remove		= dwc3_qcom_remove,
+	.remove_new	= dwc3_qcom_remove,
 	.driver		= {
 		.name	= "dwc3-qcom",
 		.pm	= &dwc3_qcom_dev_pm_ops,