Merge branch 'linus' into tracing/core

Merge reason: tracing/core was on an older, pre-rc1 base.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

7 files changed, 78 insertions, 5 deletions

diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index a632689b61b4..cbdd6284996d 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -258,8 +258,8 @@ static inline bool nf_ct_kill(struct nf_conn *ct)
 /* Update TCP window tracking data when NAT mangles the packet */
 extern void nf_conntrack_tcp_update(const struct sk_buff *skb,
                                     unsigned int dataoff,
-                                    struct nf_conn *ct,
-                                    int dir);
+                                    struct nf_conn *ct, int dir,
+                                    s16 offset);
 
 /* Fake conntrack entry for untracked connections */
 extern struct nf_conn nf_conntrack_untracked;
diff --git a/include/net/phonet/pn_dev.h b/include/net/phonet/pn_dev.h
index 5054dc5ea2c2..29d126736611 100644
--- a/include/net/phonet/pn_dev.h
+++ b/include/net/phonet/pn_dev.h
@@ -45,6 +45,7 @@ int phonet_address_add(struct net_device *dev, u8 addr);
 int phonet_address_del(struct net_device *dev, u8 addr);
 u8 phonet_address_get(struct net_device *dev, u8 addr);
 int phonet_address_lookup(struct net *net, u8 addr);
+void phonet_address_notify(int event, struct net_device *dev, u8 addr);
 
 #define PN_NO_ADDR      0xff
 
diff --git a/include/net/protocol.h b/include/net/protocol.h
index ffa5b8b1f1df..1089d5aabd49 100644
--- a/include/net/protocol.h
+++ b/include/net/protocol.h
@@ -53,7 +53,7 @@ struct inet6_protocol
 
         void    (*err_handler)(struct sk_buff *skb,
                                struct inet6_skb_parm *opt,
-                               int type, int code, int offset,
+                               u8 type, u8 code, int offset,
                                __be32 info);
 
         int     (*gso_send_check)(struct sk_buff *skb);
diff --git a/include/net/rawv6.h b/include/net/rawv6.h
index 8a22599f26ba..f6b9b830df8c 100644
--- a/include/net/rawv6.h
+++ b/include/net/rawv6.h
@@ -6,7 +6,7 @@
 #include <net/protocol.h>
 
 void raw6_icmp_error(struct sk_buff *, int nexthdr,
-                int type, int code, int inner_offset, __be32);
+                u8 type, u8 code, int inner_offset, __be32);
 int raw6_local_deliver(struct sk_buff *, int);
 
 extern int                      rawv6_rcv(struct sock *sk,
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index 9f80a7668289..d16a304cbed4 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -448,6 +448,7 @@ static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
 {
         struct sctp_ulpevent *event = sctp_skb2event(skb);
 
+        skb_orphan(skb);
         skb->sk = sk;
         skb->destructor = sctp_sock_rfree;
         atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
diff --git a/include/net/sock.h b/include/net/sock.h
index 07133c5e9868..2c0da9239b95 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -54,6 +54,7 @@
 
 #include <linux/filter.h>
 #include <linux/rculist_nulls.h>
+#include <linux/poll.h>
 
 #include <asm/atomic.h>
 #include <net/dst.h>
@@ -1241,6 +1242,74 @@ static inline int sk_has_allocations(const struct sock *sk)
         return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk);
 }
 
+/**
+ * sk_has_sleeper - check if there are any waiting processes
+ * @sk: socket
+ *
+ * Returns true if socket has waiting processes
+ *
+ * The purpose of the sk_has_sleeper and sock_poll_wait is to wrap the memory
+ * barrier call. They were added due to the race found within the tcp code.
+ *
+ * Consider following tcp code paths:
+ *
+ * CPU1                  CPU2
+ *
+ * sys_select            receive packet
+ *   ...                 ...
+ *   __add_wait_queue    update tp->rcv_nxt
+ *   ...                 ...
+ *   tp->rcv_nxt check   sock_def_readable
+ *   ...                 {
+ *   schedule               ...
+ *                          if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ *                              wake_up_interruptible(sk->sk_sleep)
+ *                          ...
+ *                       }
+ *
+ * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay
+ * in its cache, and so does the tp->rcv_nxt update on CPU2 side.  The CPU1
+ * could then endup calling schedule and sleep forever if there are no more
+ * data on the socket.
+ *
+ * The sk_has_sleeper is always called right after a call to read_lock, so we
+ * can use smp_mb__after_lock barrier.
+ */
+static inline int sk_has_sleeper(struct sock *sk)
+{
+        /*
+         * We need to be sure we are in sync with the
+         * add_wait_queue modifications to the wait queue.
+         *
+         * This memory barrier is paired in the sock_poll_wait.
+         */
+        smp_mb__after_lock();
+        return sk->sk_sleep && waitqueue_active(sk->sk_sleep);
+}
+
+/**
+ * sock_poll_wait - place memory barrier behind the poll_wait call.
+ * @filp:           file
+ * @wait_address:   socket wait queue
+ * @p:              poll_table
+ *
+ * See the comments in the sk_has_sleeper function.
+ */
+static inline void sock_poll_wait(struct file *filp,
+                wait_queue_head_t *wait_address, poll_table *p)
+{
+        if (p && wait_address) {
+                poll_wait(filp, wait_address, p);
+                /*
+                 * We need to be sure we are in sync with the
+                 * socket flags modification.
+                 *
+                 * This memory barrier is paired in the sk_has_sleeper.
+                */
+                smp_mb();
+        }
+}
+
 /*
  *      Queue a received datagram if it will fit. Stream and sequenced
  *      protocols can't normally use this as they need to fit buffers in
@@ -1252,6 +1321,7 @@ static inline int sk_has_allocations(const struct sock *sk)
 
 static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
 {
+        skb_orphan(skb);
         skb->sk = sk;
         skb->destructor = sock_wfree;
         /*
@@ -1264,6 +1334,7 @@ static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
 
 static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
 {
+        skb_orphan(skb);
         skb->sk = sk;
         skb->destructor = sock_rfree;
         atomic_add(skb->truesize, &sk->sk_rmem_alloc);
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 736bca450886..9e3a3f4c1f60 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1274,7 +1274,7 @@ struct xfrm_tunnel {
 struct xfrm6_tunnel {
         int (*handler)(struct sk_buff *skb);
         int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
-                           int type, int code, int offset, __be32 info);
+                           u8 type, u8 code, int offset, __be32 info);
         struct xfrm6_tunnel *next;
         int priority;
 };