[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>

1 files changed, 6 insertions, 3 deletions

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 27970a58d29b..fc0bff74c61e 100644
--- 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);