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 <[email protected]>
---
drivers/char/hw_random/atmel-rng.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
index a37367ebcbac..e9157255f851 100644
--- a/drivers/char/hw_random/atmel-rng.c
+++ b/drivers/char/hw_random/atmel-rng.c
@@ -161,15 +161,13 @@ static int atmel_trng_probe(struct platform_device *pdev)
return ret;
}
-static int atmel_trng_remove(struct platform_device *pdev)
+static void atmel_trng_remove(struct platform_device *pdev)
{
struct atmel_trng *trng = platform_get_drvdata(pdev);
atmel_trng_cleanup(trng);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
-
- return 0;
}
static int __maybe_unused atmel_trng_runtime_suspend(struct device *dev)
@@ -218,7 +216,7 @@ MODULE_DEVICE_TABLE(of, atmel_trng_dt_ids);
static struct platform_driver atmel_trng_driver = {
.probe = atmel_trng_probe,
- .remove = atmel_trng_remove,
+ .remove_new = atmel_trng_remove,
.driver = {
.name = "atmel-trng",
.pm = pm_ptr(&atmel_trng_pm_ops),
--
2.42.0
On 10/12/2023 at 23:12, 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 <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
> ---
> drivers/char/hw_random/atmel-rng.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
> index a37367ebcbac..e9157255f851 100644
> --- a/drivers/char/hw_random/atmel-rng.c
> +++ b/drivers/char/hw_random/atmel-rng.c
> @@ -161,15 +161,13 @@ static int atmel_trng_probe(struct platform_device *pdev)
> return ret;
> }
>
> -static int atmel_trng_remove(struct platform_device *pdev)
> +static void atmel_trng_remove(struct platform_device *pdev)
> {
> struct atmel_trng *trng = platform_get_drvdata(pdev);
>
> atmel_trng_cleanup(trng);
> pm_runtime_disable(&pdev->dev);
> pm_runtime_set_suspended(&pdev->dev);
> -
> - return 0;
> }
>
> static int __maybe_unused atmel_trng_runtime_suspend(struct device *dev)
> @@ -218,7 +216,7 @@ MODULE_DEVICE_TABLE(of, atmel_trng_dt_ids);
>
> static struct platform_driver atmel_trng_driver = {
> .probe = atmel_trng_probe,
> - .remove = atmel_trng_remove,
> + .remove_new = atmel_trng_remove,
> .driver = {
> .name = "atmel-trng",
> .pm = pm_ptr(&atmel_trng_pm_ops),
> --
> 2.42.0
>