hwrng: ingenic - Fix a resource leak in an error handling path

[ Upstream commit c4ff41b93d1f10d1b8be258c31a0436c5769fc00 ]

In case of error, we should call 'clk_disable_unprepare()' to undo a
previous 'clk_prepare_enable()' call, as already done in the remove
function.

Fixes: 406346d22278 ("hwrng: ingenic - Add hardware TRNG for Ingenic X1830")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Tested-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/char/hw_random/ingenic-trng.c b/drivers/char/hw_random/ingenic-trng.c
index 954a8411d67d2fb885c36b111f510067b1c16add..0eb80f786f4dd57506f0a004b729e3d832e85798 100644 (file)
--- a/drivers/char/hw_random/ingenic-trng.c
+++ b/drivers/char/hw_random/ingenic-trng.c
@@ -113,13 +113,17 @@ static int ingenic_trng_probe(struct platform_device *pdev)
        ret = hwrng_register(&trng->rng);
        if (ret) {
                dev_err(&pdev->dev, "Failed to register hwrng\n");
-               return ret;
+               goto err_unprepare_clk;
        }
 
        platform_set_drvdata(pdev, trng);
 
        dev_info(&pdev->dev, "Ingenic DTRNG driver registered\n");
        return 0;
+
+err_unprepare_clk:
+       clk_disable_unprepare(trng->clk);
+       return ret;
 }
 
 static int ingenic_trng_remove(struct platform_device *pdev)