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scsi: hisi_sas: fix the risk of freeing slot twice

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The function hisi_sas_slot_task_free() is used to free the slot and do
tidy-up of LLDD resources. The LLDD generally should know the state of
a slot and decide when to free it, and it should only be done once.

For some scenarios, we really don't know the state, like when TMF
timeout. In this case, we check task->lldd_task before calling
hisi_sas_slot_task_free().

However, we may miss some scenarios when we should also check
task->lldd_task, and it is not SMP safe to check task->lldd_task as we
don't protect it within spin lock.

This patch is to fix this risk of freeing slot twice, as follows:

  1. Check task->lldd_task in the hisi_sas_slot_task_free(), and give
     up freeing of this time if task->lldd_task is NULL.

  2. Set slot->buf to NULL after it is freed.

Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Xiaofei Tan 2017-10-24 23:51:38 +08:00 committed by Martin K. Petersen
parent 378c233bcb
commit 6ba0fbc35a
1 changed files with 6 additions and 3 deletions
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9
drivers/scsi/hisi_sas/hisi_sas_main.c
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@ -185,13 +185,16 @@ void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba, struct sas_task *task,
struct domain_device *device = task->dev;
struct hisi_sas_device *sas_dev = device->lldd_dev;
if (!task->lldd_task)
return;
task->lldd_task = NULL;
if (!sas_protocol_ata(task->task_proto))
if (slot->n_elem)
dma_unmap_sg(dev, task->scatter, slot->n_elem,
task->data_dir);
task->lldd_task = NULL;
if (sas_dev)
atomic64_dec(&sas_dev->running_req);
}
@ -199,8 +202,8 @@ void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba, struct sas_task *task,
if (slot->buf)
dma_pool_free(hisi_hba->buffer_pool, slot->buf, slot->buf_dma);
list_del_init(&slot->entry);
slot->buf = NULL;
slot->task = NULL;
slot->port = NULL;
hisi_sas_slot_index_free(hisi_hba, slot->idx);