From: oulijun <oulijun@huawei.com>
Date: Fri, 4 May 2018 02:57:10 +0000 (+0800)
Subject: RDMA/hns: Set desc_dma_addr for zero when free cmq desc
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=90e7a4d5066240b75cdfd1bf8944ca36622153b1;p=openwrt%2Fstaging%2Fblogic.git

RDMA/hns: Set desc_dma_addr for zero when free cmq desc

In order to avoid illegal use for desc_dma_addr of ring,
it needs to set it zero when free cmq desc.

Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
---

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index a40978bbc1d0..46c3ab97e1ba 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -617,6 +617,8 @@ static void hns_roce_free_cmq_desc(struct hns_roce_dev *hr_dev,
 	dma_unmap_single(hr_dev->dev, ring->desc_dma_addr,
 			 ring->desc_num * sizeof(struct hns_roce_cmq_desc),
 			 DMA_BIDIRECTIONAL);
+
+	ring->desc_dma_addr = 0;
 	kfree(ring->desc);
 }