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>

diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index d1c16bbee9326b7f3cbce9421e276310dffa4d2e..4e705f87969f332c30939dc8acabd4f8d4d74352 100644 (file)
--- 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;