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 d1c16bb..4e705f8 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -1037,10 +1037,6 @@
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 @@
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 @@
msg->msg_namelen = sizeof(*sax);
-out: skb_free_datagram(sk, skb);
+ skb_free_datagram(sk, skb);
release_sock(sk);
return copied;