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    Subject[PATCH AUTOSEL 4.19 02/25] RDMA/hns: Correct the value of HNS_ROCE_HEM_CHUNK_LEN
    Date
    From: Sirong Wang <wangsirong@huawei.com>

    [ Upstream commit 531eb45b3da4267fc2a64233ba256c8ffb02edd2 ]

    Size of pointer to buf field of struct hns_roce_hem_chunk should be
    considered when calculating HNS_ROCE_HEM_CHUNK_LEN, or sg table size will
    be larger than expected when allocating hem.

    Fixes: 9a4435375cd1 ("IB/hns: Add driver files for hns RoCE driver")
    Link: https://lore.kernel.org/r/1572575610-52530-2-git-send-email-liweihang@hisilicon.com
    Signed-off-by: Sirong Wang <wangsirong@huawei.com>
    Signed-off-by: Weihang Li <liweihang@hisilicon.com>
    Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/infiniband/hw/hns/hns_roce_hem.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/infiniband/hw/hns/hns_roce_hem.h b/drivers/infiniband/hw/hns/hns_roce_hem.h
    index e8850d59e7804..a94444db3045a 100644
    --- a/drivers/infiniband/hw/hns/hns_roce_hem.h
    +++ b/drivers/infiniband/hw/hns/hns_roce_hem.h
    @@ -54,7 +54,7 @@ enum {

    #define HNS_ROCE_HEM_CHUNK_LEN \
    ((256 - sizeof(struct list_head) - 2 * sizeof(int)) / \
    - (sizeof(struct scatterlist)))
    + (sizeof(struct scatterlist) + sizeof(void *)))

    #define check_whether_bt_num_3(type, hop_num) \
    (type < HEM_TYPE_MTT && hop_num == 2)
    --
    2.20.1
    \
     
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