linux-kernel - [PATCH 1/4] hwrng: cctrng - don't open code init and exit functions

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Message-Id: <20230719071806.335718-2-martin@kaiser.cx>
Date:   Wed, 19 Jul 2023 09:18:03 +0200
From:   Martin Kaiser <martin@...ser.cx>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Martin Kaiser <martin@...ser.cx>
Subject: [PATCH 1/4] hwrng: cctrng - don't open code init and exit functions

Do not open code the init and exit functions of the cctrng driver.

If we move the BUILD_BUG_ON checks into the probe function, we can use
module_platform_driver and make the code shorter.

Signed-off-by: Martin Kaiser <martin@...ser.cx>
---
 drivers/char/hw_random/cctrng.c | 20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/char/hw_random/cctrng.c b/drivers/char/hw_random/cctrng.c
index 302ffa354c2f..241da7e44675 100644
--- a/drivers/char/hw_random/cctrng.c
+++ b/drivers/char/hw_random/cctrng.c
@@ -492,6 +492,10 @@ static int cctrng_probe(struct platform_device *pdev)
 	u32 val;
 	int irq;
 
+	/* Compile time assertion checks */
+	BUILD_BUG_ON(CCTRNG_DATA_BUF_WORDS < 6);
+	BUILD_BUG_ON((CCTRNG_DATA_BUF_WORDS & (CCTRNG_DATA_BUF_WORDS-1)) != 0);
+
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
@@ -698,21 +702,7 @@ static struct platform_driver cctrng_driver = {
 	.remove = cctrng_remove,
 };
 
-static int __init cctrng_mod_init(void)
-{
-	/* Compile time assertion checks */
-	BUILD_BUG_ON(CCTRNG_DATA_BUF_WORDS < 6);
-	BUILD_BUG_ON((CCTRNG_DATA_BUF_WORDS & (CCTRNG_DATA_BUF_WORDS-1)) != 0);
-
-	return platform_driver_register(&cctrng_driver);
-}
-module_init(cctrng_mod_init);
-
-static void __exit cctrng_mod_exit(void)
-{
-	platform_driver_unregister(&cctrng_driver);
-}
-module_exit(cctrng_mod_exit);
+module_platform_driver(cctrng_driver);
 
 /* Module description */
 MODULE_DESCRIPTION("ARM CryptoCell TRNG Driver");
-- 
2.30.2