linux-kernel - [PATCH 3/5] crypto: gcm - use template array registering API to simplify the code

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Date:   Wed, 18 Jul 2018 15:30:53 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     <agk@...hat.com>, <snitzer@...hat.com>,
        <herbert@...dor.apana.org.au>
CC:     <dm-devel@...hat.com>, <linux-kernel@...r.kernel.org>,
        <wangxiongfeng2@...wei.com>, <broonie@...nel.org>, <arnd@...db.de>,
        <jonathan.cameron@...wei.com>
Subject: [PATCH 3/5] crypto: gcm - use template array registering API to simplify the code

Use crypto template array registering API to simplify the code.

Signed-off-by: Xiongfeng Wang <xiongfeng.wang@...aro.org>
---
 crypto/gcm.c | 76 +++++++++++++++++++++---------------------------------------
 1 file changed, 26 insertions(+), 50 deletions(-)

diff --git a/crypto/gcm.c b/crypto/gcm.c
index 0ad879e..b180536 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -727,12 +727,6 @@ static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
 					ctr_name, "ghash");
 }
 
-static struct crypto_template crypto_gcm_tmpl = {
-	.name = "gcm",
-	.create = crypto_gcm_create,
-	.module = THIS_MODULE,
-};
-
 static int crypto_gcm_base_create(struct crypto_template *tmpl,
 				  struct rtattr **tb)
 {
@@ -756,12 +750,6 @@ static int crypto_gcm_base_create(struct crypto_template *tmpl,
 					ctr_name, ghash_name);
 }
 
-static struct crypto_template crypto_gcm_base_tmpl = {
-	.name = "gcm_base",
-	.create = crypto_gcm_base_create,
-	.module = THIS_MODULE,
-};
-
 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
 				 unsigned int keylen)
 {
@@ -989,12 +977,6 @@ static int crypto_rfc4106_create(struct crypto_template *tmpl,
 	goto out;
 }
 
-static struct crypto_template crypto_rfc4106_tmpl = {
-	.name = "rfc4106",
-	.create = crypto_rfc4106_create,
-	.module = THIS_MODULE,
-};
-
 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
 				 unsigned int keylen)
 {
@@ -1231,10 +1213,29 @@ static int crypto_rfc4543_create(struct crypto_template *tmpl,
 	goto out;
 }
 
-static struct crypto_template crypto_rfc4543_tmpl = {
-	.name = "rfc4543",
-	.create = crypto_rfc4543_create,
-	.module = THIS_MODULE,
+#define GCM_TEMPLATE_NUM 4
+
+static struct crypto_template crypto_gcm_tmpl[GCM_TEMPLATE_NUM] = {
+	{
+		.name = "gcm_base",
+		.create = crypto_gcm_base_create,
+		.module = THIS_MODULE,
+	},
+	{
+		.name = "gcm",
+		.create = crypto_gcm_create,
+		.module = THIS_MODULE,
+	},
+	{
+		.name = "rfc4106",
+		.create = crypto_rfc4106_create,
+		.module = THIS_MODULE,
+	},
+	{
+		.name = "rfc4543",
+		.create = crypto_rfc4543_create,
+		.module = THIS_MODULE,
+	},
 };
 
 static int __init crypto_gcm_module_init(void)
@@ -1247,42 +1248,17 @@ static int __init crypto_gcm_module_init(void)
 
 	sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
 
-	err = crypto_register_template(&crypto_gcm_base_tmpl);
-	if (err)
-		goto out;
-
-	err = crypto_register_template(&crypto_gcm_tmpl);
+	err = crypto_register_template_array(crypto_gcm_tmpl, GCM_TEMPLATE_NUM);
 	if (err)
-		goto out_undo_base;
+		kfree(gcm_zeroes);
 
-	err = crypto_register_template(&crypto_rfc4106_tmpl);
-	if (err)
-		goto out_undo_gcm;
-
-	err = crypto_register_template(&crypto_rfc4543_tmpl);
-	if (err)
-		goto out_undo_rfc4106;
-
-	return 0;
-
-out_undo_rfc4106:
-	crypto_unregister_template(&crypto_rfc4106_tmpl);
-out_undo_gcm:
-	crypto_unregister_template(&crypto_gcm_tmpl);
-out_undo_base:
-	crypto_unregister_template(&crypto_gcm_base_tmpl);
-out:
-	kfree(gcm_zeroes);
 	return err;
 }
 
 static void __exit crypto_gcm_module_exit(void)
 {
 	kfree(gcm_zeroes);
-	crypto_unregister_template(&crypto_rfc4543_tmpl);
-	crypto_unregister_template(&crypto_rfc4106_tmpl);
-	crypto_unregister_template(&crypto_gcm_tmpl);
-	crypto_unregister_template(&crypto_gcm_base_tmpl);
+	crypto_unregister_template_array(crypto_gcm_tmpl, GCM_TEMPLATE_NUM);
 }
 
 module_init(crypto_gcm_module_init);
-- 
1.7.12.4