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scsi: hisi_sas: use atomic64_t for hisi_sas_device.running_req 

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@huawei.com>
Reviewed-by: Xiang Chen <chenxiang66@hisilicon.com>
Reviewed-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
John Garry 2016-11-07 20:48:39 +08:00 committed by Martin K. Petersen
parent 04708ff4c2
commit f696cc32b5
4 changed files with 10 additions and 9 deletions
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2
drivers/scsi/hisi_sas/hisi_sas.h
View File

@ -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;
};

9
drivers/scsi/hisi_sas/hisi_sas_main.c
View File

@ -162,8 +162,8 @@ out:
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 @@ hisi_sas_internal_abort_task_exec(struct hisi_hba *hisi_hba, u64 device_id,
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);

4
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
View File

@ -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;

4
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
View File

@ -1728,8 +1728,8 @@ slot_complete_v2_hw(struct hisi_hba *hisi_hba, struct hisi_sas_slot *slot,
}
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;