| Message ID | 20231009083856.222030-5-u.kleine-koenig@pengutronix.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | pinctrl: Convert to platform remove callback returning void | expand |
On Mon, Oct 09, 2023 at 10:38:40AM +0200, 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() 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: Charles Keepax <ckeepax@opensource.cirrus.com> Thanks, Charles
On Mon, Oct 9, 2023 at 11:22 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() 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> Patch applied. Yours, Linus Walleij
diff --git a/drivers/pinctrl/cirrus/pinctrl-madera-core.c b/drivers/pinctrl/cirrus/pinctrl-madera-core.c index bb589922d8c5..898b197c3738 100644 --- a/drivers/pinctrl/cirrus/pinctrl-madera-core.c +++ b/drivers/pinctrl/cirrus/pinctrl-madera-core.c @@ -1084,19 +1084,17 @@ static int madera_pin_probe(struct platform_device *pdev) return 0; } -static int madera_pin_remove(struct platform_device *pdev) +static void madera_pin_remove(struct platform_device *pdev) { struct madera_pin_private *priv = platform_get_drvdata(pdev); if (priv->madera->pdata.gpio_configs) pinctrl_unregister_mappings(priv->madera->pdata.gpio_configs); - - return 0; } static struct platform_driver madera_pin_driver = { .probe = madera_pin_probe, - .remove = madera_pin_remove, + .remove_new = madera_pin_remove, .driver = { .name = "madera-pinctrl", },
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/pinctrl/cirrus/pinctrl-madera-core.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)