[NET]: Conditionally use bh_lock_sock_nested in sk_receive_skb
Spotted by Ian McDonald, tentatively fixed by Gerrit Renker:
http://www.mail-archive.com/dccp%40vger.kernel.org/msg00599.html
Rewritten not to unroll sk_receive_skb, in the common case, i.e. no lock
debugging, its optimized away.
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
diff --git a/net/core/sock.c b/net/core/sock.c
index 32ff1c5..ab8fafa 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -270,7 +270,7 @@
}
EXPORT_SYMBOL(sock_queue_rcv_skb);
-int sk_receive_skb(struct sock *sk, struct sk_buff *skb)
+int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
{
int rc = NET_RX_SUCCESS;
@@ -279,7 +279,10 @@
skb->dev = NULL;
- bh_lock_sock(sk);
+ if (nested)
+ bh_lock_sock_nested(sk);
+ else
+ bh_lock_sock(sk);
if (!sock_owned_by_user(sk)) {
/*
* trylock + unlock semantics:
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index a20eb71..7114bef 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -899,7 +899,7 @@
goto discard_and_relse;
nf_reset(skb);
- return sk_receive_skb(sk, skb);
+ return sk_receive_skb(sk, skb, 1);
no_dccp_socket:
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 6eda430..03bb829 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -888,7 +888,7 @@
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
goto discard_and_relse;
- return sk_receive_skb(sk, skb) ? -1 : 0;
+ return sk_receive_skb(sk, skb, 1) ? -1 : 0;
no_dccp_socket:
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
diff --git a/net/decnet/dn_nsp_in.c b/net/decnet/dn_nsp_in.c
index 7683d4f..39a6cf7 100644
--- a/net/decnet/dn_nsp_in.c
+++ b/net/decnet/dn_nsp_in.c
@@ -804,7 +804,7 @@
goto free_out;
}
- return sk_receive_skb(sk, skb);
+ return sk_receive_skb(sk, skb, 0);
}
return dn_nsp_no_socket(skb, reason);