[PATCH 04/19] scsi: hisi_sas: grab hisi_hba.lock when processing slots

[John Garry]

From: Xiang Chen <chenxian...@hisilicon.com>

When adding/removing slots from device list, we need to
lock this operation with hisi_hba lock for safety.

This patch adds missing instances of this.

Signed-off-by: Xiang Chen <chenxian...@hisilicon.com>
Signed-off-by: John Garry <john.ga...@huawei.com>
---
 drivers/scsi/hisi_sas/hisi_sas_main.c  | 5 ++++-
 drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 2 ++
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 2 ++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c 
b/drivers/scsi/hisi_sas/hisi_sas_main.c
index e038bdf..254af67 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -401,7 +401,9 @@ static int hisi_sas_task_prep(struct sas_task *task, struct 
hisi_sas_dq
                goto err_out_buf;
        }
 
+       spin_lock_irqsave(&hisi_hba->lock, flags);
        list_add_tail(&slot->entry, &sas_dev->list);
+       spin_unlock_irqrestore(&hisi_hba->lock, flags);
        spin_lock_irqsave(&task->task_state_lock, flags);
        task->task_state_flags |= SAS_TASK_AT_INITIATOR;
        spin_unlock_irqrestore(&task->task_state_lock, flags);
@@ -1387,8 +1389,9 @@ static int hisi_sas_query_task(struct sas_task *task)
        if (rc)
                goto err_out_buf;
 
-
+       spin_lock_irqsave(&hisi_hba->lock, flags);
        list_add_tail(&slot->entry, &sas_dev->list);
+       spin_unlock_irqrestore(&hisi_hba->lock, flags);
        spin_lock_irqsave(&task->task_state_lock, flags);
        task->task_state_flags |= SAS_TASK_AT_INITIATOR;
        spin_unlock_irqrestore(&task->task_state_lock, flags);
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c 
b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 73d12ff..3b2e5b5 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -2378,7 +2378,9 @@ static void slot_err_v2_hw(struct hisi_hba *hisi_hba,
 
        if (unlikely(aborted)) {
                ts->stat = SAS_ABORTED_TASK;
+               spin_lock_irqsave(&hisi_hba->lock, flags);
                hisi_sas_slot_task_free(hisi_hba, task, slot);
+               spin_unlock_irqrestore(&hisi_hba->lock, flags);
                return -1;
        }
 
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c 
b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index d60501f..38eeba9 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -1400,7 +1400,9 @@ static irqreturn_t int_chnl_int_v3_hw(int irq_no, void *p)
        ts->resp = SAS_TASK_COMPLETE;
        if (unlikely(aborted)) {
                ts->stat = SAS_ABORTED_TASK;
+               spin_lock_irqsave(&hisi_hba->lock, flags);
                hisi_sas_slot_task_free(hisi_hba, task, slot);
+               spin_unlock_irqrestore(&hisi_hba->lock, flags);
                return -1;
        }
 
-- 
1.9.1