scsi: qla2xxx: Retry fabric Scan on IOCB queue full

when fabric scan thread encounters IOCB Q Full, schedule a delayed work to
retry fabric scan.
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_gs.c

@@ -4053,9 +4053,6 @@ static int qla24xx_async_gnnft(scsi_qla_host_t *vha, struct srb *sp,
 
 	rval = qla2x00_start_sp(sp);
 	if (rval != QLA_SUCCESS) {
-		spin_lock_irqsave(&vha->work_lock, flags);
-		vha->scan.scan_flags &= ~SF_SCANNING;
-		spin_unlock_irqrestore(&vha->work_lock, flags);
 		goto done_free_sp;
 	}
 
@@ -4079,6 +4076,17 @@ static int qla24xx_async_gnnft(scsi_qla_host_t *vha, struct srb *sp,
 
 	sp->free(sp);
 
+	spin_lock_irqsave(&vha->work_lock, flags);
+	vha->scan.scan_flags &= ~SF_SCANNING;
+	if (vha->scan.scan_flags == 0) {
+		ql_dbg(ql_dbg_disc, vha, 0xffff,
+		    "%s: schedule\n", __func__);
+		vha->scan.scan_flags |= SF_QUEUED;
+		schedule_delayed_work(&vha->scan.scan_work, 5);
+	}
+	spin_unlock_irqrestore(&vha->work_lock, flags);
+
+
 	return rval;
 } /* GNNFT */
 
@@ -4208,9 +4216,6 @@ int qla24xx_async_gpnft(scsi_qla_host_t *vha, u8 fc4_type, srb_t *sp)
 
 	rval = qla2x00_start_sp(sp);
 	if (rval != QLA_SUCCESS) {
-		spin_lock_irqsave(&vha->work_lock, flags);
-		vha->scan.scan_flags &= ~SF_SCANNING;
-		spin_unlock_irqrestore(&vha->work_lock, flags);
 		goto done_free_sp;
 	}
 
@@ -4234,6 +4239,17 @@ int qla24xx_async_gpnft(scsi_qla_host_t *vha, u8 fc4_type, srb_t *sp)
 
 	sp->free(sp);
 
+	spin_lock_irqsave(&vha->work_lock, flags);
+	vha->scan.scan_flags &= ~SF_SCANNING;
+	if (vha->scan.scan_flags == 0) {
+		ql_dbg(ql_dbg_disc, vha, 0xffff,
+		    "%s: schedule\n", __func__);
+		vha->scan.scan_flags |= SF_QUEUED;
+		schedule_delayed_work(&vha->scan.scan_work, 5);
+	}
+	spin_unlock_irqrestore(&vha->work_lock, flags);
+
+
 	return rval;
 }