Received-SPF: pass (google.com: domain of linux-crypto-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) client-ip=2620:137:e000::3:2;
From:   =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= 
        <u.kleine-koenig@pengutronix.de>
To:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>
Cc:     Weili Qian <qianweili@huawei.com>, linux-crypto@vger.kernel.org,
        kernel@pengutronix.de
Subject: [PATCH 19/42] crypto: hisilicon/trng - Convert to platform remove callback returning void
Date:   Fri, 20 Oct 2023 09:55:41 +0200
Message-ID: <20231020075521.2121571-63-u.kleine-koenig@pengutronix.de>
In-Reply-To: <20231020075521.2121571-44-u.kleine-koenig@pengutronix.de>
References: <20231020075521.2121571-44-u.kleine-koenig@pengutronix.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

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/hisilicon/trng/trng.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/hisilicon/trng/trng.c b/drivers/crypto/hisilicon/trng/trng.c
index 97e500db0a82..451b167bcc73 100644
--- a/drivers/crypto/hisilicon/trng/trng.c
+++ b/drivers/crypto/hisilicon/trng/trng.c
@@ -303,7 +303,7 @@ static int hisi_trng_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int hisi_trng_remove(struct platform_device *pdev)
+static void hisi_trng_remove(struct platform_device *pdev)
 {
 	struct hisi_trng *trng = platform_get_drvdata(pdev);
 
@@ -314,8 +314,6 @@ static int hisi_trng_remove(struct platform_device *pdev)
 	if (trng->ver != HISI_TRNG_VER_V1 &&
 	    atomic_dec_return(&trng_active_devs) == 0)
 		crypto_unregister_rng(&hisi_trng_alg);
-
-	return 0;
 }
 
 static const struct acpi_device_id hisi_trng_acpi_match[] = {
@@ -326,7 +324,7 @@ MODULE_DEVICE_TABLE(acpi, hisi_trng_acpi_match);
 
 static struct platform_driver hisi_trng_driver = {
 	.probe		= hisi_trng_probe,
-	.remove         = hisi_trng_remove,
+	.remove_new     = hisi_trng_remove,
 	.driver		= {
 		.name	= "hisi-trng-v2",
 		.acpi_match_table = ACPI_PTR(hisi_trng_acpi_match),
-- 
2.42.0