[PATCH] hwrng: imx-rngc: check clk_prepare_enable() return value

["Li Youhong" <dayou5941@163.com>]

From: Li Youhong <liyouhong@kylinos.cn>

The driver ignored clk_prepare_enable() failures during probe and
resume.  If enabling the RNG clock fails, subsequent register accesses
or resume after system sleep may not work while the driver still reports
success.

Signed-off-by: Li Youhong <liyouhong@kylinos.cn>
---
 drivers/char/hw_random/imx-rngc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c
index 7693328f1056..0545a1870146 100644
--- a/drivers/char/hw_random/imx-rngc.c
+++ b/drivers/char/hw_random/imx-rngc.c
@@ -266,7 +266,9 @@ static int __init imx_rngc_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return irq;
 
-	clk_prepare_enable(rngc->clk);
+	ret = clk_prepare_enable(rngc->clk);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret, "Cannot enable rng_clk\n");
 
 	ver_id = readl(rngc->base + RNGC_VER_ID);
 	rng_type = FIELD_GET(RNG_TYPE, ver_id);
@@ -338,9 +340,7 @@ static int imx_rngc_resume(struct device *dev)
 {
 	struct imx_rngc *rngc = dev_get_drvdata(dev);
 
-	clk_prepare_enable(rngc->clk);
-
-	return 0;
+	return clk_prepare_enable(rngc->clk);
 }
 
 static const struct dev_pm_ops imx_rngc_pm_ops = {
-- 
2.25.1