diff mbox series

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

Message ID 20231020075521.2121571-60-u.kleine-koenig@pengutronix.de (mailing list archive)
State Accepted
Commit b0d49b30ef64ac879b491080bf80ef7bcb293ef6
Headers show
Series crypto: Convert to platform remove callback returning void | expand

Commit Message

Uwe Kleine-König Oct. 20, 2023, 7:55 a.m. UTC
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(-)

Comments

Krzysztof Kozlowski Oct. 20, 2023, 8:18 a.m. UTC | #1
On 20/10/2023 09:55, 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.
> 

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof
Andi Shyti Oct. 24, 2023, 9:52 p.m. UTC | #2
Hi Uwe,

On Fri, Oct 20, 2023 at 09:55:38AM +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>

Reviewed-by: Andi Shyti <andi.shyti@kernel.org>

Andi
diff mbox series

Patch

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);