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

BugLink: https://bugs.launchpad.net/bugs/1770974
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>
(cherry picked from commit 90e7a4d5066240b75cdfd1bf8944ca36622153b1)
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index a46c15d3f6a54096f3064923fdd05045f6570253..0c9047d308518c2e985c7f14f660861a6187280d 100644 (file)
--- 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);
 }