From: Quinn Tran <quinn.tran@cavium.com>
Date: Thu, 28 Dec 2017 12:33:27 -0800
Subject: scsi: qla2xxx: Add lock protection around host lookup
Patch-mainline: v4.16-rc1
Git-commit: 9d1aa4e14e0ba10f946dafd46679f16f93013d58
References: bsc#1077338

Host lookup via btree is currently protected by the hardware_lock.
Add hardware_lock when modifying btree to store host pointer.

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>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/scsi/qla2xxx/qla_init.c   |    3 +++
 drivers/scsi/qla2xxx/qla_mid.c    |    9 +++++----
 drivers/scsi/qla2xxx/qla_target.c |    6 ------
 3 files changed, 8 insertions(+), 10 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -3939,6 +3939,7 @@ qla2x00_configure_hba(scsi_qla_host_t *v
 	struct qla_hw_data *ha = vha->hw;
 	scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);
 	port_id_t id;
+	unsigned long flags;
 
 	/* Get host addresses. */
 	rval = qla2x00_get_adapter_id(vha,
@@ -4020,7 +4021,9 @@ qla2x00_configure_hba(scsi_qla_host_t *v
 	id.b.area = area;
 	id.b.al_pa = al_pa;
 	id.b.rsvd_1 = 0;
+	spin_lock_irqsave(&ha->hardware_lock, flags);
 	qlt_update_host_map(vha, id);
+	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
 	if (!vha->flags.init_done)
 		ql_log(ql_log_info, vha, 0x2010,
--- a/drivers/scsi/qla2xxx/qla_mid.c
+++ b/drivers/scsi/qla2xxx/qla_mid.c
@@ -50,10 +50,11 @@ qla24xx_allocate_vp_id(scsi_qla_host_t *
 
 	spin_lock_irqsave(&ha->vport_slock, flags);
 	list_add_tail(&vha->list, &ha->vp_list);
+	spin_unlock_irqrestore(&ha->vport_slock, flags);
 
+	spin_lock_irqsave(&ha->hardware_lock, flags);
 	qlt_update_vp_map(vha, SET_VP_IDX);
-
-	spin_unlock_irqrestore(&ha->vport_slock, flags);
+	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
 	mutex_unlock(&ha->vport_lock);
 	return vp_id;
@@ -158,9 +159,9 @@ qla24xx_disable_vp(scsi_qla_host_t *vha)
 	atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
 
 	/* Remove port id from vp target map */
-	spin_lock_irqsave(&vha->hw->vport_slock, flags);
+	spin_lock_irqsave(&vha->hw->hardware_lock, flags);
 	qlt_update_vp_map(vha, RESET_AL_PA);
-	spin_unlock_irqrestore(&vha->hw->vport_slock, flags);
+	spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
 
 	qla2x00_mark_vp_devices_dead(vha);
 	atomic_set(&vha->vp_state, VP_FAILED);
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -7204,20 +7204,14 @@ qlt_update_vp_map(struct scsi_qla_host *
 
 void qlt_update_host_map(struct scsi_qla_host *vha, port_id_t id)
 {
-	unsigned long flags;
-	struct qla_hw_data *ha = vha->hw;
 
 	if (!vha->d_id.b24) {
-		spin_lock_irqsave(&ha->vport_slock, flags);
 		vha->d_id = id;
 		qlt_update_vp_map(vha, SET_AL_PA);
-		spin_unlock_irqrestore(&ha->vport_slock, flags);
 	} else if (vha->d_id.b24 != id.b24) {
-		spin_lock_irqsave(&ha->vport_slock, flags);
 		qlt_update_vp_map(vha, RESET_AL_PA);
 		vha->d_id = id;
 		qlt_update_vp_map(vha, SET_AL_PA);
-		spin_unlock_irqrestore(&ha->vport_slock, flags);
 	}
 }