| Message ID | 20231117095922.876489-11-u.kleine-koenig@pengutronix.de (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | net*: Convert to platform remove callback returning void | expand |
Hello. On 17.11.23 10:59, 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> > --- > drivers/net/ieee802154/mac802154_hwsim.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c > index 31cba9aa7636..2c2483bbe780 100644 > --- a/drivers/net/ieee802154/mac802154_hwsim.c > +++ b/drivers/net/ieee802154/mac802154_hwsim.c > @@ -1035,7 +1035,7 @@ static int hwsim_probe(struct platform_device *pdev) > return err; > } > > -static int hwsim_remove(struct platform_device *pdev) > +static void hwsim_remove(struct platform_device *pdev) > { > struct hwsim_phy *phy, *tmp; > > @@ -1043,13 +1043,11 @@ static int hwsim_remove(struct platform_device *pdev) > list_for_each_entry_safe(phy, tmp, &hwsim_phys, list) > hwsim_del(phy); > mutex_unlock(&hwsim_phys_lock); > - > - return 0; > } > > static struct platform_driver mac802154hwsim_driver = { > .probe = hwsim_probe, > - .remove = hwsim_remove, > + .remove_new = hwsim_remove, > .driver = { > .name = "mac802154_hwsim", > }, Acked-by: Stefan Schmidt <stefan@datenfreihafen.org> regards Stefan Schmidt
On Fri, 2023-11-17 at 09:59:33 UTC, =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= 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: Stefan Schmidt <stefan@datenfreihafen.org> Applied to https://git.kernel.org/pub/scm/linux/kernel/git/wpan/wpan-next.git staging, thanks. Miquel
diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c index 31cba9aa7636..2c2483bbe780 100644 --- a/drivers/net/ieee802154/mac802154_hwsim.c +++ b/drivers/net/ieee802154/mac802154_hwsim.c @@ -1035,7 +1035,7 @@ static int hwsim_probe(struct platform_device *pdev) return err; } -static int hwsim_remove(struct platform_device *pdev) +static void hwsim_remove(struct platform_device *pdev) { struct hwsim_phy *phy, *tmp; @@ -1043,13 +1043,11 @@ static int hwsim_remove(struct platform_device *pdev) list_for_each_entry_safe(phy, tmp, &hwsim_phys, list) hwsim_del(phy); mutex_unlock(&hwsim_phys_lock); - - return 0; } static struct platform_driver mac802154hwsim_driver = { .probe = hwsim_probe, - .remove = hwsim_remove, + .remove_new = hwsim_remove, .driver = { .name = "mac802154_hwsim", },
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/net/ieee802154/mac802154_hwsim.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)