[RFC 6/7] scsi: iscsi: remove conn_mutex

[Mike Christie <michael.christie@oracle.com>]

We don't need the conn mutex now because conn stop and ep_disconnect wait
for kernel conn_stop/ep_disconnects.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/scsi/scsi_transport_iscsi.c | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index da9fce1dceeb..ed69449166ae 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1619,12 +1619,6 @@ static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 static struct sock *nls;
 static DEFINE_MUTEX(rx_queue_mutex);
 
-/*
- * conn_mutex protects the {start,bind,stop,destroy}_conn from racing
- * against the kernel stop_connection recovery mechanism
- */
-static DEFINE_MUTEX(conn_mutex);
-
 static LIST_HEAD(sesslist);
 static DEFINE_SPINLOCK(sesslock);
 static LIST_HEAD(connlist);
@@ -2886,11 +2880,8 @@ iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev
 
 	ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
 
-	mutex_lock(&conn_mutex);
 	if (transport->destroy_conn)
 		transport->destroy_conn(conn);
-	mutex_unlock(&conn_mutex);
-
 	return 0;
 }
 
@@ -3773,13 +3764,11 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
 			break;
 		}
 
-		mutex_lock(&conn_mutex);
 		ev->r.retcode =	transport->bind_conn(session, conn,
 						ev->u.b_conn.transport_eph,
 						ev->u.b_conn.is_leading);
 		if (!ev->r.retcode)
 			conn->state = ISCSI_CONN_BOUND;
-		mutex_unlock(&conn_mutex);
 
 		if (ev->r.retcode || !transport->ep_connect)
 			break;
@@ -3802,11 +3791,9 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
 	case ISCSI_UEVENT_START_CONN:
 		conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
 		if (conn) {
-			mutex_lock(&conn_mutex);
 			ev->r.retcode = transport->start_conn(conn);
 			if (!ev->r.retcode)
 				conn->state = ISCSI_CONN_UP;
-			mutex_unlock(&conn_mutex);
 		}
 		else
 			err = -EINVAL;
@@ -3829,14 +3816,11 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
 
 		conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
 		if (conn) {
-			mutex_lock(&conn_mutex);
 			ev->r.retcode =	transport->send_pdu(conn,
 				(struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
 				(char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
 				ev->u.send_pdu.data_size);
-			mutex_unlock(&conn_mutex);
-		}
-		else
+		} else
 			err = -EINVAL;
 		break;
 	case ISCSI_UEVENT_GET_STATS:
-- 
2.25.1