Merge commit '683b6c6f82a60fabf47012581c2cfbf1b037ab95' into stable/for-linus-3.15

This merge of the irq-core-for-linus branch broke the ARM build when
Xen is enabled.

Conflicts:
	drivers/xen/events/events_base.c

1 files changed, 13 insertions, 7 deletions

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 29fc8bee9702..94404f19f9de 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -163,9 +163,8 @@ static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)
 
 static inline unsigned int unix_hash_fold(__wsum n)
 {
-        unsigned int hash = (__force unsigned int)n;
+        unsigned int hash = (__force unsigned int)csum_fold(n);
 
-        hash ^= hash>>16;
         hash ^= hash>>8;
         return hash&(UNIX_HASH_SIZE-1);
 }
@@ -1788,8 +1787,11 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
                 goto out;
 
         err = mutex_lock_interruptible(&u->readlock);
-        if (err) {
-                err = sock_intr_errno(sock_rcvtimeo(sk, noblock));
+        if (unlikely(err)) {
+                /* recvmsg() in non blocking mode is supposed to return -EAGAIN
+                 * sk_rcvtimeo is not honored by mutex_lock_interruptible()
+                 */
+                err = noblock ? -EAGAIN : -ERESTARTSYS;
                 goto out;
         }
 
@@ -1914,6 +1916,7 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
         struct unix_sock *u = unix_sk(sk);
         DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, msg->msg_name);
         int copied = 0;
+        int noblock = flags & MSG_DONTWAIT;
         int check_creds = 0;
         int target;
         int err = 0;
@@ -1929,7 +1932,7 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
                 goto out;
 
         target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
-        timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
+        timeo = sock_rcvtimeo(sk, noblock);
 
         /* Lock the socket to prevent queue disordering
          * while sleeps in memcpy_tomsg
@@ -1941,8 +1944,11 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
         }
 
         err = mutex_lock_interruptible(&u->readlock);
-        if (err) {
-                err = sock_intr_errno(timeo);
+        if (unlikely(err)) {
+                /* recvmsg() in non blocking mode is supposed to return -EAGAIN
+                 * sk_rcvtimeo is not honored by mutex_lock_interruptible()
+                 */
+                err = noblock ? -EAGAIN : -ERESTARTSYS;
                 goto out;
         }