[PATCH v3 12/14] IB/isert: Fix hang in target_wait_for_cmds

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

This removes the target_wait_for_cmds call from isert, to fix a hang that
occurs when isert's calls target_wait_for_cmds to wait on running
commands, but also ends up waiting on failed SCSI commands or TMR
responses that are on the iscsit response queue. When isert_wait_conn is
called the tx thread is down, so the response queue will not be
processed and the target_wait_for_cmds call will never wake up.

This is safe because iscsit can now handle cleaning up both iscsit and
isert commands that are running/completing and stuck on the response
queue.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/infiniband/ulp/isert/ib_isert.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index f290cd49698e..516fa37494e1 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -2500,17 +2500,6 @@ isert_wait4logout(struct isert_conn *isert_conn)
 	}
 }
 
-static void
-isert_wait4cmds(struct iscsit_conn *conn)
-{
-	isert_info("iscsit_conn %p\n", conn);
-
-	if (conn->sess) {
-		target_stop_cmd_counter(conn->cmd_cnt);
-		target_wait_for_cmds(conn->cmd_cnt);
-	}
-}
-
 /**
  * isert_put_unsol_pending_cmds() - Drop commands waiting for
  *     unsolicitate dataout
@@ -2558,7 +2547,6 @@ static void isert_wait_conn(struct iscsit_conn *conn)
 
 	ib_drain_qp(isert_conn->qp);
 	isert_put_unsol_pending_cmds(conn);
-	isert_wait4cmds(conn);
 	isert_wait4logout(isert_conn);
 
 	queue_work(isert_release_wq, &isert_conn->release_work);
-- 
2.25.1