From: Gregory CLEMENT <gregory.clement@bootlin.com>
Date: Tue, 13 Mar 2018 17:48:41 +0100
Subject: crypto: inside-secure - improve clock initialization

Git-commit: 5b37689653cbe73d24760428c236feb15ccad2aa
Patch-mainline: v4.17-rc1
References: fate#326470

The clock is optional, but if it is present we should managed it. If
there is an error while trying getting it, we should exit and report this
error.

So instead of returning an error only in the -EPROBE case, turn it in an
other way and ignore the clock only if it is not present (-ENOENT case).

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/crypto/inside-secure/safexcel.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/crypto/inside-secure/safexcel.c b/drivers/crypto/inside-secure/safexcel.c
index 09adeaa0da6b..cbcb5d9f17bd 100644
--- a/drivers/crypto/inside-secure/safexcel.c
+++ b/drivers/crypto/inside-secure/safexcel.c
@@ -882,16 +882,17 @@ static int safexcel_probe(struct platform_device *pdev)
 	}
 
 	priv->clk = devm_clk_get(&pdev->dev, NULL);
-	if (!IS_ERR(priv->clk)) {
+	ret = PTR_ERR_OR_ZERO(priv->clk);
+	/* The clock isn't mandatory */
+	if  (ret != -ENOENT) {
+		if (ret)
+			return ret;
+
 		ret = clk_prepare_enable(priv->clk);
 		if (ret) {
 			dev_err(dev, "unable to enable clk (%d)\n", ret);
 			return ret;
 		}
-	} else {
-		/* The clock isn't mandatory */
-		if (PTR_ERR(priv->clk) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
 	}
 
 	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
-- 
2.11.0