dlm: keep listening connection alive with sctp mode

The connection struct with nodeid 0 is the listening socket,
not a connection to another node.  The sctp resend function
was not checking that the nodeid was valid (non-zero), so it
would mistakenly get and resend on the listening connection
when nodeid was zero.

Signed-off-by: Lidong Zhong <lzhong@suse.com>
Signed-off-by: David Teigland <teigland@redhat.com>

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 1e5b45359509590f90910a90797e901da7629745..d08e079ea5d3aa37cf685cce89eb00122fe7ba02 100644 (file)
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -617,6 +617,11 @@ static void retry_failed_sctp_send(struct connection *recv_con,
        int nodeid = sn_send_failed->ssf_info.sinfo_ppid;
 
        log_print("Retry sending %d bytes to node id %d", len, nodeid);
+       
+       if (!nodeid) {
+               log_print("Shouldn't resend data via listening connection.");
+               return;
+       }
 
        con = nodeid2con(nodeid, 0);
        if (!con) {