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af_iucv: avoid path quiesce of severed path in shutdown() 

An af_iucv stress test showed -EPIPE results for sendmsg()
calls. They are caused by quiescing a path even though it has
been already severed by peer. For IUCV transport shutdown()
consists of 2 steps:
(1) sending the shutdown message to peer
(2) quiescing the iucv path
If the iucv path between these 2 steps is severed due to peer
closing the path, the quiesce step is no longer needed.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <blaschka@linux.vnet.ibm.com>
Reported-by: Philipp Hachtmann <phacht@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Ursula Braun 2014-07-21 12:54:44 +02:00 committed by David S. Miller
parent 45cbb2e499
commit 1042cab862
1 changed files with 2 additions and 1 deletions
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3
net/iucv/af_iucv.c
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@ -1542,7 +1542,8 @@ static int iucv_sock_shutdown(struct socket *sock, int how)
sk->sk_shutdown |= how;
if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
if (iucv->transport == AF_IUCV_TRANS_IUCV) {
if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
iucv->path) {
err = pr_iucv->path_quiesce(iucv->path, NULL);
if (err)
err = -ENOTCONN;