From: Erik Hugne Date: Wed, 19 Feb 2014 07:37:58 +0000 (+0100) Subject: tipc: failed transmissions should return error X-Git-Tag: firefly_0821_release~176^2~4167^2~293 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=63fa01c147b98eaf5e5e4620c3c7bea8e9ddbbc1;p=firefly-linux-kernel-4.4.55.git tipc: failed transmissions should return error When a message could not be sent out because the destination node or link could not be found, the full message size is returned from sendmsg() as if it had been sent successfully. An application will then get a false indication that it's making forward progress. This problem has existed since the initial commit in 2.6.16. We change this to return -ENETUNREACH if the message cannot be delivered due to the destination node/link being unavailable. We also get rid of the redundant tipc_reject_msg call since freeing the buffer and doing a tipc_port_iovec_reject accomplishes exactly the same thing. Signed-off-by: Erik Hugne Reviewed-by: Jon Maloy Signed-off-by: David S. Miller --- diff --git a/net/tipc/link.c b/net/tipc/link.c index 284d6383ad6c..d1a764b9b2d8 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -1020,12 +1020,9 @@ exit: read_unlock_bh(&tipc_net_lock); /* Couldn't find a link to the destination node */ - if (buf) - return tipc_reject_msg(buf, TIPC_ERR_NO_NODE); - if (res >= 0) - return tipc_port_iovec_reject(sender, hdr, msg_sect, len, - TIPC_ERR_NO_NODE); - return res; + kfree_skb(buf); + tipc_port_iovec_reject(sender, hdr, msg_sect, len, TIPC_ERR_NO_NODE); + return -ENETUNREACH; } /* @@ -1163,8 +1160,9 @@ error: } else { reject: kfree_skb_list(buf_chain); - return tipc_port_iovec_reject(sender, hdr, msg_sect, - len, TIPC_ERR_NO_NODE); + tipc_port_iovec_reject(sender, hdr, msg_sect, len, + TIPC_ERR_NO_NODE); + return -ENETUNREACH; } /* Append chain of fragments to send queue & send them */