netdev - [PATCH net-next] tcp: remove invalid _

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Message-ID: <1372148466.3301.85.camel@edumazet-glaptop>
Date:	Tue, 25 Jun 2013 01:21:06 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>, Jerry Chu <hkchu@...gle.com>
Subject: [PATCH net-next] tcp: remove invalid __rcu annotation

From: Eric Dumazet <edumazet@...gle.com>

struct tcp_fastopen_context has a field named tfm, which is a pointer
to a crypto_cipher structure.

It currently has a __rcu annotation, which is not needed at all.

tcp_fastopen_ctx is the pointer fetched by rcu_dereference(), but once
we have a pointer to current tcp_fastopen_context, we do not use/need
rcu_dereference() to access tfm.

This fixes a lot of sparse errors like the following :

net/ipv4/tcp_fastopen.c:21:31: warning: incorrect type in argument 1 (different address spaces)
net/ipv4/tcp_fastopen.c:21:31:    expected struct crypto_cipher *tfm
net/ipv4/tcp_fastopen.c:21:31:    got struct crypto_cipher [noderef] <asn:4>*tfm

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Jerry Chu <hkchu@...gle.com>
---
 include/net/tcp.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5bba80f..3239997 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1319,9 +1319,9 @@ void tcp_fastopen_cookie_gen(__be32 addr, struct tcp_fastopen_cookie *foc);
 
 /* Fastopen key context */
 struct tcp_fastopen_context {
-	struct crypto_cipher __rcu	*tfm;
-	__u8				key[TCP_FASTOPEN_KEY_LENGTH];
-	struct rcu_head			rcu;
+	struct crypto_cipher	*tfm;
+	__u8			key[TCP_FASTOPEN_KEY_LENGTH];
+	struct rcu_head		rcu;
 };
 
 /* write queue abstraction */


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