linux-kernel - [PATCH 2/8] crypto: Use ERR

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Date:	Sat, 22 May 2010 11:59:48 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 2/8] crypto: Use ERR_CAST

From: Julia Lawall <julia@...u.dk>

Use ERR_CAST(x) rather than ERR_PTR(PTR_ERR(x)).  The former makes more
clear what is the purpose of the operation, which otherwise looks like a
no-op.

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

// <smpl>
@@
type T;
T x;
identifier f;
@@

T f (...) { <+...
- ERR_PTR(PTR_ERR(x))
+ x
 ...+> }

@@
expression x;
@@

- ERR_PTR(PTR_ERR(x))
+ ERR_CAST(x)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 crypto/authenc.c |    2 +-
 crypto/ctr.c     |    2 +-
 crypto/xts.c     |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff -u -p a/crypto/authenc.c b/crypto/authenc.c
--- a/crypto/authenc.c
+++ b/crypto/authenc.c
@@ -612,7 +612,7 @@ static struct crypto_instance *crypto_au
 	auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
 			       CRYPTO_ALG_TYPE_AHASH_MASK);
 	if (IS_ERR(auth))
-		return ERR_PTR(PTR_ERR(auth));
+		return ERR_CAST(auth);
 
 	auth_base = &auth->base;
 
diff -u -p a/crypto/ctr.c b/crypto/ctr.c
--- a/crypto/ctr.c
+++ b/crypto/ctr.c
@@ -185,7 +185,7 @@ static struct crypto_instance *crypto_ct
 	alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER,
 				  CRYPTO_ALG_TYPE_MASK);
 	if (IS_ERR(alg))
-		return ERR_PTR(PTR_ERR(alg));
+		return ERR_CAST(alg);
 
 	/* Block size must be >= 4 bytes. */
 	err = -EINVAL;
diff -u -p a/crypto/xts.c b/crypto/xts.c
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -224,7 +224,7 @@ static struct crypto_instance *alloc(str
 	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
 				  CRYPTO_ALG_TYPE_MASK);
 	if (IS_ERR(alg))
-		return ERR_PTR(PTR_ERR(alg));
+		return ERR_CAST(alg);
 
 	inst = crypto_alloc_instance("xts", alg);
 	if (IS_ERR(inst))
--
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