tipc: allow connection shutdown callback to be invoked in advance

Currently connection shutdown callback function is called when
connection instance is released in tipc_conn_kref_release(), and
receiving packets and sending packets are running in different
threads. Even if connection is closed by the thread of receiving
packets, its shutdown callback may not be called immediately as
the connection reference count is non-zero at that moment. So,
although the connection is shut down by the thread of receiving
packets, the thread of sending packets doesn't know it. Before
its shutdown callback is invoked to tell the sending thread its
connection has been closed, the sending thread may deliver
messages by tipc_conn_sendmsg(), this is why the following error
information appears:

"Sending subscription event failed, no memory"

To eliminate it, allow connection shutdown callback function to
be called before connection id is removed in tipc_close_conn(),
which makes the sending thread know the truth in time that its
socket is closed so that it doesn't send message to it. We also
remove the "Sending XXX failed..." error reporting for topology
and config services.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/tipc/config.c b/net/tipc/config.c
index e74eef2e749011188a3d420f0bd8201c3d58f5c6..e6d721692ae016bbc900ac909406ca0a645848b0 100644 (file)
--- a/net/tipc/config.c
+++ b/net/tipc/config.c
@@ -376,7 +376,6 @@ static void cfg_conn_msg_event(int conid, struct sockaddr_tipc *addr,
        struct tipc_cfg_msg_hdr *req_hdr;
        struct tipc_cfg_msg_hdr *rep_hdr;
        struct sk_buff *rep_buf;
-       int ret;
 
        /* Validate configuration message header (ignore invalid message) */
        req_hdr = (struct tipc_cfg_msg_hdr *)buf;
@@ -398,12 +397,8 @@ static void cfg_conn_msg_event(int conid, struct sockaddr_tipc *addr,
                memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
                rep_hdr->tcm_len = htonl(rep_buf->len);
                rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
-
-               ret = tipc_conn_sendmsg(&cfgsrv, conid, addr, rep_buf->data,
-                                       rep_buf->len);
-               if (ret < 0)
-                       pr_err("Sending cfg reply message failed, no memory\n");
-
+               tipc_conn_sendmsg(&cfgsrv, conid, addr, rep_buf->data,
+                                 rep_buf->len);
                kfree_skb(rep_buf);
        }
 }

diff --git a/net/tipc/server.c b/net/tipc/server.c
index 373979789a73538bdd55dac4bde74505dc4310a9..bbaa8f56024a5d13de1df0ac8032849449c42c0d 100644 (file)
--- a/net/tipc/server.c
+++ b/net/tipc/server.c
@@ -87,7 +87,6 @@ static void tipc_clean_outqueues(struct tipc_conn *con);
 static void tipc_conn_kref_release(struct kref *kref)
 {
        struct tipc_conn *con = container_of(kref, struct tipc_conn, kref);
-       struct tipc_server *s = con->server;
 
        if (con->sock) {
                tipc_sock_release_local(con->sock);
@@ -95,10 +94,6 @@ static void tipc_conn_kref_release(struct kref *kref)
        }
 
        tipc_clean_outqueues(con);
-
-       if (con->conid)
-               s->tipc_conn_shutdown(con->conid, con->usr_data);
-
        kfree(con);
 }
 
@@ -181,6 +176,9 @@ static void tipc_close_conn(struct tipc_conn *con)
        struct tipc_server *s = con->server;
 
        if (test_and_clear_bit(CF_CONNECTED, &con->flags)) {
+               if (con->conid)
+                       s->tipc_conn_shutdown(con->conid, con->usr_data);
+
                spin_lock_bh(&s->idr_lock);
                idr_remove(&s->conn_idr, con->conid);
                s->idr_in_use--;

diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index 7cb0bd5b1176872dcd09ca830a8a01c5b1ec37c6..a6ce3bbf3eaf88ecf4827f36263ac1c53b7014bb 100644 (file)
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -96,20 +96,16 @@ static void subscr_send_event(struct tipc_subscription *sub, u32 found_lower,
 {
        struct tipc_subscriber *subscriber = sub->subscriber;
        struct kvec msg_sect;
-       int ret;
 
        msg_sect.iov_base = (void *)&sub->evt;
        msg_sect.iov_len = sizeof(struct tipc_event);
-
        sub->evt.event = htohl(event, sub->swap);
        sub->evt.found_lower = htohl(found_lower, sub->swap);
        sub->evt.found_upper = htohl(found_upper, sub->swap);
        sub->evt.port.ref = htohl(port_ref, sub->swap);
        sub->evt.port.node = htohl(node, sub->swap);
-       ret = tipc_conn_sendmsg(&topsrv, subscriber->conid, NULL,
-                               msg_sect.iov_base, msg_sect.iov_len);
-       if (ret < 0)
-               pr_err("Sending subscription event failed, no memory\n");
+       tipc_conn_sendmsg(&topsrv, subscriber->conid, NULL, msg_sect.iov_base,
+                         msg_sect.iov_len);
 }
 
 /**