leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

tipc: allow connection shutdown callback to be invoked in advance

Browse Source 
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>
This commit is contained in:
Ying Xue 2014-03-06 14:40:16 +01:00 committed by David S. Miller
parent 9e9cb6221a
commit 6d4ebeb4df
3 changed files with 7 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
net/tipc/config.c
View File

@ -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);
}
}

8
net/tipc/server.c
View File

@ -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--;

8
net/tipc/subscr.c
View File

@ -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);
}
/**