[PATCH 16/42] crypto: exynos-rng - Convert to platform remove callback returning void

Uwe Kleine-König
2023-10-20T07:57:20Z

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/crypto/exynos-rng.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/exynos-rng.c b/drivers/crypto/exynos-rng.c
index 5d60a4bcb511..0dd8baf16cb4 100644
--- a/drivers/crypto/exynos-rng.c
+++ b/drivers/crypto/exynos-rng.c
@@ -306,13 +306,11 @@ static int exynos_rng_probe(struct platform_device *pdev)
return ret;
}

-static int exynos_rng_remove(struct platform_device *pdev)
+static void exynos_rng_remove(struct platform_device *pdev)
{
crypto_unregister_rng(&exynos_rng_alg);

exynos_rng_dev = NULL;
-
- return 0;
}

static int __maybe_unused exynos_rng_suspend(struct device *dev)
@@ -391,7 +389,7 @@ static struct platform_driver exynos_rng_driver = {
.of_match_table = exynos_rng_dt_match,
},
.probe = exynos_rng_probe,
- .remove = exynos_rng_remove,
+ .remove_new = exynos_rng_remove,
};

module_platform_driver(exynos_rng_driver);
--
2.42.0