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RDS: TCP: rds_tcp_accept_worker() must exit gracefully when terminating rds-tcp 

There are two instances where we want to terminate RDS-TCP: when
exiting the netns or during module unload. In either case, the
termination sequence is to stop the listen socket, mark the
rtn->rds_tcp_listen_sock as null, and flush any accept workqs.
Thus any workqs that get flushed at this point will encounter a
null rds_tcp_listen_sock, and must exit gracefully to allow
the RDS-TCP termination to complete successfully.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sowmini Varadhan 2016-05-18 10:06:23 -07:00 committed by David S. Miller
parent fc64869c48
commit 37e14f4fe2
1 changed files with 3 additions and 0 deletions
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3
net/rds/tcp_listen.c
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@ -80,6 +80,9 @@ int rds_tcp_accept_one(struct socket *sock)
int conn_state;
struct sock *nsk;
if (!sock) /* module unload or netns delete in progress */
return -ENETUNREACH;
ret = sock_create_kern(sock_net(sock->sk), sock->sk->sk_family,
sock->sk->sk_type, sock->sk->sk_protocol,
&new_sock);