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From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
To: Akhil R <akhilrajeev@nvidia.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"David S. Miller" <davem@davemloft.net>
Cc: Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	linux-crypto@vger.kernel.org,
	linux-tegra@vger.kernel.org,
	kernel@pengutronix.de
Subject: [PATCH] crypto: tegra-se - Convert to platform remove callback returning void
Date: Mon, 15 Apr 2024 09:34:21 +0200
Message-ID: <20240415073422.8274-2-u.kleine-koenig@pengutronix.de>
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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.

Fixes: 0880bb3b00c8 ("crypto: tegra - Add Tegra Security Engine driver")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
Hello,

this driver appeared in today's next. Given that I want to change struct
platform_driver::remove soon (probably in next after the upcoming merge
window), it would be great if the driver could be adapted immediately.

Best regards
Uwe

 drivers/crypto/tegra/tegra-se-main.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/tegra/tegra-se-main.c b/drivers/crypto/tegra/tegra-se-main.c
index f4758e320615..9955874b3dc3 100644
--- a/drivers/crypto/tegra/tegra-se-main.c
+++ b/drivers/crypto/tegra/tegra-se-main.c
@@ -320,7 +320,7 @@ static int tegra_se_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int tegra_se_remove(struct platform_device *pdev)
+static void tegra_se_remove(struct platform_device *pdev)
 {
 	struct tegra_se *se = platform_get_drvdata(pdev);
 
@@ -328,8 +328,6 @@ static int tegra_se_remove(struct platform_device *pdev)
 	crypto_engine_exit(se->engine);
 	iommu_fwspec_free(se->dev);
 	host1x_client_unregister(&se->client);
-
-	return 0;
 }
 
 static const struct tegra_se_regs tegra234_aes1_regs = {
@@ -390,7 +388,7 @@ static struct platform_driver tegra_se_driver = {
 		.of_match_table = tegra_se_of_match,
 	},
 	.probe		= tegra_se_probe,
-	.remove		= tegra_se_remove,
+	.remove_new	= tegra_se_remove,
 };
 
 static int tegra_se_host1x_probe(struct host1x_device *dev)

base-commit: 6bd343537461b57f3efe5dfc5fc193a232dfef1e
-- 
2.43.0