Sometimes the value of hisi_sas_device.running_req
would go negative unless we have the check for
running_req >= 0 before trying to decrement.
This is because using running_req is not thread-safe.
As such, the value for running_req may be actually incorrect,
so use atomic64_t instead.
Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
Reviewed-by: Xiang Chen <chenxiang66@xxxxxxxxxxxxx>
---
drivers/scsi/hisi_sas/hisi_sas.h | 2 +-
drivers/scsi/hisi_sas/hisi_sas_main.c | 9 +++++----
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 4 ++--
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 4 ++--
4 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index bf59fab..8b5ecc6 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -111,7 +111,7 @@ struct hisi_sas_device {
struct domain_device *sas_device;
u64 attached_phy;
u64 device_id;
- u64 running_req;
+ atomic64_t running_req;
u8 dev_status;
};
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 504cbcf..18e2194 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -162,8 +162,8 @@ static void hisi_sas_slot_abort(struct work_struct *work)
hisi_sas_slot_task_free(hisi_hba, task, abort_slot);
if (task->task_done)
task->task_done(task);
- if (sas_dev && sas_dev->running_req)
- sas_dev->running_req--;
+ if (sas_dev)
+ atomic64_dec(&sas_dev->running_req);
}
static int hisi_sas_task_prep(struct sas_task *task, struct hisi_hba *hisi_hba,
@@ -303,7 +303,7 @@ static int hisi_sas_task_prep(struct sas_task *task, struct hisi_hba *hisi_hba,
hisi_hba->slot_prep = slot;
- sas_dev->running_req++;
+ atomic64_inc(&sas_dev->running_req);
++(*pass);
return 0;
@@ -1027,7 +1027,8 @@ static int hisi_sas_query_task(struct sas_task *task)
hisi_hba->slot_prep = slot;
- sas_dev->running_req++;
+ atomic64_inc(&sas_dev->running_req);
+
/* send abort command to our chip */
hisi_hba->hw->start_delivery(hisi_hba);
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
index bbc5760..05177fc 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
@@ -1366,8 +1366,8 @@ static int slot_complete_v1_hw(struct hisi_hba *hisi_hba,
}
out:
- if (sas_dev && sas_dev->running_req)
- sas_dev->running_req--;
+ if (sas_dev)
+ atomic64_dec(&sas_dev->running_req);
hisi_sas_slot_task_free(hisi_hba, task, slot);
sts = ts->stat;
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index cda3baf..e88113a 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -1728,8 +1728,8 @@ static void slot_err_v2_hw(struct hisi_hba *hisi_hba,
}
out:
- if (sas_dev && sas_dev->running_req)
- sas_dev->running_req--;
+ if (sas_dev)
+ atomic64_dec(&sas_dev->running_req);
hisi_sas_slot_task_free(hisi_hba, task, slot);
sts = ts->stat;
--
1.9.1
--
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