[PATCH 4.19 012/243] RDMA/hns: Correct the value of HNS_ROCE_HEM_CHUNK_LEN

Greg Kroah-Hartman
2019-12-11T15:16:10Z

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