Revert "netrom: zero length frame filtering in NetRom"

This reverts commit a3ac80a130300573de351083cf4a5b46d233e8bf.

Alan Cox says that zero length writes do have special meaning
and are useful in this protocol.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 10 deletions

diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index d1c16bbee932..4e705f87969f 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -1037,10 +1037,6 @@ static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
         unsigned char *asmptr;
         int size;
 
-        /* Netrom empty data frame has no meaning : don't send */
-        if (len == 0)
-                return 0;
-
         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
                 return -EINVAL;
 
@@ -1175,11 +1171,6 @@ static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
         skb_reset_transport_header(skb);
         copied     = skb->len;
 
-        /* NetRom empty data frame has no meaning : ignore it */
-        if (copied == 0) {
-                goto out;
-        }
-
         if (copied > size) {
                 copied = size;
                 msg->msg_flags |= MSG_TRUNC;
@@ -1195,7 +1186,7 @@ static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
 
         msg->msg_namelen = sizeof(*sax);
 
-out:    skb_free_datagram(sk, skb);
+        skb_free_datagram(sk, skb);
 
         release_sock(sk);
         return copied;