A problem we are hitting is that we could hit a network issue

when a command/data is in the process of being sent. The snd
buffer space goes to zero and sendpage returns -EAGAIN. We then
wait for space to open. If space never opens then the cmd rsp timer
fires and the session/connection is dropped.

During that time we could try to send a nop as a ping, but it
is stuck behind that other command that got EAGAIN and we are
waiting for space to open to send them. We would expect the
nop in timer to fire before the cmd rsp timer, but it cannot
becuase the nop is sitting in the internal iscsi-scst queue.

This patch just has us start the timer ont he nop in right
away.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@5091 d57e44dd-8a1f-0410-8b47-8ef2f437770f

iscsi-scst/kernel/iscsi.c

@@ -3818,6 +3818,14 @@ void iscsi_send_nop_in(struct iscsi_conn *conn)
 	list_add_tail(&rsp->nop_req_list_entry, &conn->nop_req_list);
 	spin_unlock_bh(&conn->nop_req_list_lock);
 
+	/*
+	 * Start NopRsp timer now to catch case where send buffer is full due
+	 * to connection being down, so this is never even sent to tcp layer.
+	 * This prevent us from having to wait for the CmdRsp timer which
+	 * is normally much longer.
+	 */
+	req_add_to_write_timeout_list(req);
+
 out_err_free_req:
 	req_cmnd_release(req);