2016-10-14 07:34:32

by Dan Carpenter

Subject: [patch 1/2] IB/hns: Fix a couple pointer math bugs

"wqe" is a void pointer so adding sizeof() works. The original code
adds sizeof() multiplied by sizeof() so it doesn't work at all.

Fixes: 9a4435375cd1 ('IB/hns: Add driver files for hns RoCE driver')
Signed-off-by: Dan Carpenter <[email protected]>

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
index 399f5de..58b150e 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
@@ -205,8 +205,7 @@ int hns_roce_v1_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
(wr->send_flags & IB_SEND_FENCE ?
(cpu_to_le32(HNS_ROCE_WQE_FENCE)) : 0);

- wqe = (struct hns_roce_wqe_ctrl_seg *)wqe +
- sizeof(struct hns_roce_wqe_ctrl_seg);
+ wqe = wqe + sizeof(struct hns_roce_wqe_ctrl_seg);

switch (wr->opcode) {
case IB_WR_RDMA_READ:
@@ -235,8 +234,7 @@ int hns_roce_v1_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
break;
}
ctrl->flag |= cpu_to_le32(ps_opcode);
- wqe = (struct hns_roce_wqe_raddr_seg *)wqe +
- sizeof(struct hns_roce_wqe_raddr_seg);
+ wqe = wqe + sizeof(struct hns_roce_wqe_raddr_seg);

dseg = wqe;
if (wr->send_flags & IB_SEND_INLINE && wr->num_sge) {

2016-10-14 09:24:29

by oulijun

Subject: Re: [patch 1/2] IB/hns: Fix a couple pointer math bugs

在 2016/10/14 15:28, Dan Carpenter 写道:
> "wqe" is a void pointer so adding sizeof() works. The original code
> adds sizeof() multiplied by sizeof() so it doesn't work at all.
>
> Fixes: 9a4435375cd1 ('IB/hns: Add driver files for hns RoCE driver')
> Signed-off-by: Dan Carpenter <[email protected]>
>
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> index 399f5de..58b150e 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> @@ -205,8 +205,7 @@ int hns_roce_v1_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
> (wr->send_flags & IB_SEND_FENCE ?
> (cpu_to_le32(HNS_ROCE_WQE_FENCE)) : 0);
>
> - wqe = (struct hns_roce_wqe_ctrl_seg *)wqe +
> - sizeof(struct hns_roce_wqe_ctrl_seg);
> + wqe = wqe + sizeof(struct hns_roce_wqe_ctrl_seg);
>
> switch (wr->opcode) {
> case IB_WR_RDMA_READ:
> @@ -235,8 +234,7 @@ int hns_roce_v1_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
> break;
> }
> ctrl->flag |= cpu_to_le32(ps_opcode);
> - wqe = (struct hns_roce_wqe_raddr_seg *)wqe +
> - sizeof(struct hns_roce_wqe_raddr_seg);
> + wqe = wqe + sizeof(struct hns_roce_wqe_raddr_seg);
>
> dseg = wqe;
> if (wr->send_flags & IB_SEND_INLINE && wr->num_sge) {
>
> .
>
Hi, Dan Carpenter
firstly, thanks your reviewing. This quesiton is checked while i develop and test the CM function, and i have fixed it in a patch. the patch
is as follows:
https://patchwork.kernel.org/patch/9334859/

the patch is reviewing by community experts.
thanks your reviewing again.

Thanks
Lijun Ou