Revert "ax25: zero length frame filtering in AX25"

This reverts commit f99bcff7a290768e035f3d4726e103c6ebe858bf.

Like netrom, Alan Cox says that zero lengths have real meaning
and are useful in this protocol.

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

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 7da5ebb84e976c2689cb4fd338dd6c43586bdbf4..fd9d06f291dc31f4bb0d108f85d3eff51ead0e3f 100644 (file)
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1435,11 +1435,6 @@ static int ax25_sendmsg(struct kiocb *iocb, struct socket *sock,
        size_t size;
        int lv, err, addr_len = msg->msg_namelen;
 
-       /* AX.25 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;
 
@@ -1639,13 +1634,6 @@ static int ax25_recvmsg(struct kiocb *iocb, struct socket *sock,
        skb_reset_transport_header(skb);
        copied = skb->len;
 
-       /* AX.25 empty data frame has no meaning : ignore it */
-       if (copied == 0) {
-               err = copied;
-               skb_free_datagram(sk, skb);
-               goto out;
-       }
-
        if (copied > size) {
                copied = size;
                msg->msg_flags |= MSG_TRUNC;