linux-kernel - [PATCH 2/2] hwrng: imx-rngc - use devres for hwrng registration

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Message-Id: <20220815193743.105926-3-martin@kaiser.cx>
Date:   Mon, 15 Aug 2022 21:37:43 +0200
From:   Martin Kaiser <martin@...ser.cx>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        Olivia Mackall <olivia@...enic.com>
Cc:     linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Martin Kaiser <martin@...ser.cx>
Subject: [PATCH 2/2] hwrng: imx-rngc - use devres for hwrng registration

Replace hwrng_register with devm_hwrng_register and let devres unregister
our hwrng when the device is removed.

It's possible to do this now that devres also handles clock
disable+uprepare. When we had to disable+unprepare the clock ourselves,
we had to unregister the hwrng before this and couldn't use devres.

There's nothing left to do for imx_rngc_remove, this function can go.

Signed-off-by: Martin Kaiser <martin@...ser.cx>
---
 drivers/char/hw_random/imx-rngc.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c
index 23f490204341..97d8dc931ca6 100644
--- a/drivers/char/hw_random/imx-rngc.c
+++ b/drivers/char/hw_random/imx-rngc.c
@@ -292,7 +292,7 @@ static int imx_rngc_probe(struct platform_device *pdev)
 		}
 	}
 
-	ret = hwrng_register(&rngc->rng);
+	ret = devm_hwrng_register(&pdev->dev, &rngc->rng);
 	if (ret) {
 		dev_err(&pdev->dev, "hwrng registration failed\n");
 		return ret;
@@ -305,15 +305,6 @@ static int imx_rngc_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int __exit imx_rngc_remove(struct platform_device *pdev)
-{
-	struct imx_rngc *rngc = platform_get_drvdata(pdev);
-
-	hwrng_unregister(&rngc->rng);
-
-	return 0;
-}
-
 static int __maybe_unused imx_rngc_suspend(struct device *dev)
 {
 	struct imx_rngc *rngc = dev_get_drvdata(dev);
@@ -346,7 +337,6 @@ static struct platform_driver imx_rngc_driver = {
 		.pm = &imx_rngc_pm_ops,
 		.of_match_table = imx_rngc_dt_ids,
 	},
-	.remove = __exit_p(imx_rngc_remove),
 };
 
 module_platform_driver_probe(imx_rngc_driver, imx_rngc_probe);
-- 
2.30.2