[DLM] fix socket shutdown

This patch clears the user_data of active sockets as part of cleanup.
This prevents any late-arriving data from trying to add jobs to the work
queue while we are tidying up.

Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-Off-By: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 27970a5..fc0bff7 100644 (file)
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -260,7 +260,7 @@ static int nodeid_to_addr(int nodeid, struct sockaddr *retaddr)
 static void lowcomms_data_ready(struct sock *sk, int count_unused)
 {
        struct connection *con = sock2con(sk);
-       if (!test_and_set_bit(CF_READ_PENDING, &con->flags))
+       if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags))
                queue_work(recv_workqueue, &con->rwork);
 }
 
@@ -268,7 +268,7 @@ static void lowcomms_write_space(struct sock *sk)
 {
        struct connection *con = sock2con(sk);
 
-       if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags))
+       if (con && !test_and_set_bit(CF_WRITE_PENDING, &con->flags))
                queue_work(send_workqueue, &con->swork);
 }
 
@@ -1400,8 +1400,11 @@ void dlm_lowcomms_stop(void)
        down(&connections_lock);
        for (i = 0; i <= max_nodeid; i++) {
                con = __nodeid2con(i, 0);
-               if (con)
+               if (con) {
                        con->flags |= 0xFF;
+                       if (con->sock)
+                               con->sock->sk->sk_user_data = NULL;
+               }
        }
        up(&connections_lock);