linux-kernel - [PATCH 08/12] crypto: add missing of_node_put after of_device_is

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Date:   Sat, 23 Feb 2019 14:20:39 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     kernel-janitors@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 08/12] crypto: add missing of_node_put after of_device_is_available

Add an of_node_put when a tested device node is not available.

The semantic patch that fixes this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@@
identifier f;
local idexpression e;
expression x;
@@

e = f(...);
... when != of_node_put(e)
    when != x = e
    when != e = x
    when any
if (<+...of_device_is_available(e)...+>) {
  ... when != of_node_put(e)
(
  return e;
|
+ of_node_put(e);
  return ...;
)
}
// </smpl>

Fixes: 5343e674f32fb ("crypto4xx: integrate ppc4xx-rng into crypto4xx")
Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/crypto/amcc/crypto4xx_trng.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -u -p a/drivers/crypto/amcc/crypto4xx_trng.c b/drivers/crypto/amcc/crypto4xx_trng.c
--- a/drivers/crypto/amcc/crypto4xx_trng.c
+++ b/drivers/crypto/amcc/crypto4xx_trng.c
@@ -80,8 +80,10 @@ void ppc4xx_trng_probe(struct crypto4xx_
 
 	/* Find the TRNG device node and map it */
 	trng = of_find_matching_node(NULL, ppc4xx_trng_match);
-	if (!trng || !of_device_is_available(trng))
+	if (!trng || !of_device_is_available(trng)) {
+		of_node_put(trng);
 		return;
+	}
 
 	dev->trng_base = of_iomap(trng, 0);
 	of_node_put(trng);