From: Quinn Tran <quinn.tran@cavium.com>
Date: Fri, 2 Jun 2017 09:12:04 -0700
Subject: scsi: qla2xxx: Remove redundant wait when target is stopped.
Patch-mainline: v4.13-rc1
Git-commit: 3a33dc95b00be33f150bc357ab67331cdba7fc88
References: FATE#322910

Current code already destroy all target sessions when target Mode is
stopped. Target core would waits for all commands that belong to each
session to purge.  The extra wait for interrupts to settle down is not
relevant.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/scsi/qla2xxx/qla_target.c | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 324048476d9e..f9ccf845d084 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -1427,6 +1427,8 @@ int qlt_stop_phase1(struct qla_tgt *tgt)
 
 		if (npiv_vports) {
 			mutex_unlock(&qla_tgt_mutex);
+			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf021,
+			    "NPIV is in use. Can not stop target\n");
 			return -EPERM;
 		}
 	}
@@ -1437,7 +1439,7 @@ int qlt_stop_phase1(struct qla_tgt *tgt)
 		return -EPERM;
 	}
 
-	ql_dbg(ql_dbg_tgt, vha, 0xe003, "Stopping target for host %ld(%p)\n",
+	ql_dbg(ql_dbg_tgt_mgt, vha, 0xe003, "Stopping target for host %ld(%p)\n",
 	    vha->host_no, vha);
 	/*
 	 * Mutex needed to sync with qla_tgt_fc_port_[added,deleted].
@@ -1480,9 +1482,7 @@ EXPORT_SYMBOL(qlt_stop_phase1);
 /* Called by tcm_qla2xxx configfs code */
 void qlt_stop_phase2(struct qla_tgt *tgt)
 {
-	struct qla_hw_data *ha = tgt->ha;
-	scsi_qla_host_t *vha = pci_get_drvdata(ha->pdev);
-	unsigned long flags;
+	scsi_qla_host_t *vha = tgt->vha;
 
 	if (tgt->tgt_stopped) {
 		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04f,
@@ -1490,24 +1490,19 @@ void qlt_stop_phase2(struct qla_tgt *tgt)
 		dump_stack();
 		return;
 	}
-
-	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00b,
-	    "Waiting for %d IRQ commands to complete (tgt %p)",
-	    tgt->irq_cmd_count, tgt);
+	if (!tgt->tgt_stop) {
+		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00b,
+		    "%s: phase1 stop is not completed\n", __func__);
+		dump_stack();
+		return;
+	}
 
 	mutex_lock(&vha->vha_tgt.tgt_mutex);
-	spin_lock_irqsave(&ha->hardware_lock, flags);
-	while ((tgt->irq_cmd_count != 0) || (tgt->atio_irq_cmd_count != 0)) {
-		spin_unlock_irqrestore(&ha->hardware_lock, flags);
-		udelay(2);
-		spin_lock_irqsave(&ha->hardware_lock, flags);
-	}
 	tgt->tgt_stop = 0;
 	tgt->tgt_stopped = 1;
-	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 	mutex_unlock(&vha->vha_tgt.tgt_mutex);
 
-	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00c, "Stop of tgt %p finished",
+	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00c, "Stop of tgt %p finished\n",
 	    tgt);
 }
 EXPORT_SYMBOL(qlt_stop_phase2);
@@ -1517,6 +1512,10 @@ static void qlt_release(struct qla_tgt *tgt)
 {
 	scsi_qla_host_t *vha = tgt->vha;
 
+	if ((vha->vha_tgt.qla_tgt != NULL) && !tgt->tgt_stop &&
+	    !tgt->tgt_stopped)
+		qlt_stop_phase1(tgt);
+
 	if ((vha->vha_tgt.qla_tgt != NULL) && !tgt->tgt_stopped)
 		qlt_stop_phase2(tgt);
 
@@ -5531,7 +5530,7 @@ void qlt_async_event(uint16_t code, struct scsi_qla_host *vha,
 	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
 	int login_code;
 
-	if (!ha->tgt.tgt_ops)
+	if (!tgt || tgt->tgt_stop || tgt->tgt_stopped)
 		return;
 
 	if (unlikely(tgt == NULL)) {
-- 
2.12.3