| Message ID | 20230517230239.187727-41-u.kleine-koenig@pengutronix.de (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
| Series | usb: Convert to platform remove callback returning void | expand |
On Thu, May 18, 2023 at 1:03 AM Uwe Kleine-König <u.kleine-koenig@pengutronix.de> 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: Geert Uytterhoeven <geert+renesas@glider.be> Gr{oetje,eeting}s, Geert
On Thu, 18 May 2023 01:01:42 +0200 Uwe Kleine-König <u.kleine-koenig@pengutronix.de> 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/gadget/udc/renesas_usbf.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/drivers/usb/gadget/udc/renesas_usbf.c b/drivers/usb/gadget/udc/renesas_usbf.c > index 84ac9fe4ce7f..6cd0af83e91e 100644 > --- a/drivers/usb/gadget/udc/renesas_usbf.c > +++ b/drivers/usb/gadget/udc/renesas_usbf.c > @@ -3361,15 +3361,13 @@ static int usbf_probe(struct platform_device *pdev) > return 0; > } > > -static int usbf_remove(struct platform_device *pdev) > +static void usbf_remove(struct platform_device *pdev) > { > struct usbf_udc *udc = platform_get_drvdata(pdev); > > usb_del_gadget_udc(&udc->gadget); > > pm_runtime_put(&pdev->dev); > - > - return 0; > } > > static const struct of_device_id usbf_match[] = { > @@ -3385,7 +3383,7 @@ static struct platform_driver udc_driver = { > .of_match_table = usbf_match, > }, > .probe = usbf_probe, > - .remove = usbf_remove, > + .remove_new = usbf_remove, > }; > > module_platform_driver(udc_driver); Acked-by: Herve Codina <herve.codina@bootlin.com> Thanks, Hervé
diff --git a/drivers/usb/gadget/udc/renesas_usbf.c b/drivers/usb/gadget/udc/renesas_usbf.c index 84ac9fe4ce7f..6cd0af83e91e 100644 --- a/drivers/usb/gadget/udc/renesas_usbf.c +++ b/drivers/usb/gadget/udc/renesas_usbf.c @@ -3361,15 +3361,13 @@ static int usbf_probe(struct platform_device *pdev) return 0; } -static int usbf_remove(struct platform_device *pdev) +static void usbf_remove(struct platform_device *pdev) { struct usbf_udc *udc = platform_get_drvdata(pdev); usb_del_gadget_udc(&udc->gadget); pm_runtime_put(&pdev->dev); - - return 0; } static const struct of_device_id usbf_match[] = { @@ -3385,7 +3383,7 @@ static struct platform_driver udc_driver = { .of_match_table = usbf_match, }, .probe = usbf_probe, - .remove = usbf_remove, + .remove_new = usbf_remove, }; module_platform_driver(udc_driver);
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/gadget/udc/renesas_usbf.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)