linux-kernel - [PATCH net-next v2 1/2] net/tls: remove unnecessary jump instructions in do_tls_setsockopt

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Message-ID: <8a10937af81c14a942a99f1e683e2f42cf6ceee3.1647658604.git.william.xuanziyang@huawei.com>
Date:   Sat, 19 Mar 2022 11:14:33 +0800
From:   Ziyang Xuan <william.xuanziyang@...wei.com>
To:     <borisp@...dia.com>, <john.fastabend@...il.com>,
        <daniel@...earbox.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>
CC:     <davem@...emloft.net>, <pabeni@...hat.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH net-next v2 1/2] net/tls: remove unnecessary jump instructions in do_tls_setsockopt_conf()

Avoid using "goto" jump instruction unconditionally when we
can return directly. Remove unnecessary jump instructions in
do_tls_setsockopt_conf().

Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
---
 net/tls/tls_main.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 6bc2879ba637..7b2b0e7ffee4 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -553,10 +553,8 @@ static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 	int rc = 0;
 	int conf;
 
-	if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info))) {
-		rc = -EINVAL;
-		goto out;
-	}
+	if (sockptr_is_null(optval) || (optlen < sizeof(*crypto_info)))
+		return -EINVAL;
 
 	if (tx) {
 		crypto_info = &ctx->crypto_send.info;
@@ -567,10 +565,8 @@ static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 	}
 
 	/* Currently we don't support set crypto info more than one time */
-	if (TLS_CRYPTO_INFO_READY(crypto_info)) {
-		rc = -EBUSY;
-		goto out;
-	}
+	if (TLS_CRYPTO_INFO_READY(crypto_info))
+		return -EBUSY;
 
 	rc = copy_from_sockptr(crypto_info, optval, sizeof(*crypto_info));
 	if (rc) {
@@ -672,11 +668,10 @@ static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
 		ctx->sk_write_space = sk->sk_write_space;
 		sk->sk_write_space = tls_write_space;
 	}
-	goto out;
+	return 0;
 
 err_crypto_info:
 	memzero_explicit(crypto_info, sizeof(union tls_crypto_context));
-out:
 	return rc;
 }
 
-- 
2.25.1