[PATCH v2 for-next] RDMA/hns: Initialize all fields of doorbells to zero

[PATCH v2 for-next] RDMA/hns: Initialize all fields of doorbells to zero

[Weihang Li]

From: Lang Cheng <chenglang@huawei.com>

Prevent uninitialized fields when new fields are added, and make code
look simpler.

Signed-off-by: Lang Cheng <chenglang@huawei.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
---
Changes since v1:
- Just rebase against the for-next branch.

 drivers/infiniband/hw/hns/hns_roce_hw_v1.c | 9 ++-------
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 5 +----
 2 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
index c6e6658..89dac44 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
@@ -69,7 +69,7 @@ static int hns_roce_v1_post_send(struct ib_qp *ibqp,
 	struct hns_roce_wqe_data_seg *dseg = NULL;
 	struct hns_roce_qp *qp = to_hr_qp(ibqp);
 	struct device *dev = &hr_dev->pdev->dev;
-	struct hns_roce_sq_db sq_db;
+	struct hns_roce_sq_db sq_db = {};
 	int ps_opcode = 0, i = 0;
 	unsigned long flags = 0;
 	void *wqe = NULL;
@@ -318,8 +318,6 @@ static int hns_roce_v1_post_send(struct ib_qp *ibqp,
 		/* Memory barrier */
 		wmb();
 
-		sq_db.u32_4 = 0;
-		sq_db.u32_8 = 0;
 		roce_set_field(sq_db.u32_4, SQ_DOORBELL_U32_4_SQ_HEAD_M,
 			       SQ_DOORBELL_U32_4_SQ_HEAD_S,
 			      (qp->sq.head & ((qp->sq.wqe_cnt << 1) - 1)));
@@ -351,7 +349,7 @@ static int hns_roce_v1_post_recv(struct ib_qp *ibqp,
 	struct hns_roce_qp *hr_qp = to_hr_qp(ibqp);
 	struct hns_roce_dev *hr_dev = to_hr_dev(ibqp->device);
 	struct device *dev = &hr_dev->pdev->dev;
-	struct hns_roce_rq_db rq_db;
+	struct hns_roce_rq_db rq_db = {};
 	__le32 doorbell[2] = {0};
 	unsigned long flags = 0;
 	unsigned int wqe_idx;
@@ -418,9 +416,6 @@ static int hns_roce_v1_post_recv(struct ib_qp *ibqp,
 				   ROCEE_QP1C_CFG3_0_REG +
 				   QP1C_CFGN_OFFSET * hr_qp->phy_port, reg_val);
 		} else {
-			rq_db.u32_4 = 0;
-			rq_db.u32_8 = 0;
-
 			roce_set_field(rq_db.u32_4, RQ_DOORBELL_U32_4_RQ_HEAD_M,
 				       RQ_DOORBELL_U32_4_RQ_HEAD_S,
 				       hr_qp->rq.head);
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index aa9d179..55cb411 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -255,7 +255,7 @@ static int hns_roce_v2_post_send(struct ib_qp *ibqp,
 	struct hns_roce_qp *qp = to_hr_qp(ibqp);
 	struct hns_roce_wqe_frmr_seg *fseg;
 	struct device *dev = hr_dev->dev;
-	struct hns_roce_v2_db sq_db;
+	struct hns_roce_v2_db sq_db = {};
 	unsigned int owner_bit;
 	unsigned int sge_idx;
 	unsigned int wqe_idx;
@@ -583,9 +583,6 @@ static int hns_roce_v2_post_send(struct ib_qp *ibqp,
 		/* Memory barrier */
 		wmb();
 
-		sq_db.byte_4 = 0;
-		sq_db.parameter = 0;
-
 		roce_set_field(sq_db.byte_4, V2_DB_BYTE_4_TAG_M,
 			       V2_DB_BYTE_4_TAG_S, qp->doorbell_qpn);
 		roce_set_field(sq_db.byte_4, V2_DB_BYTE_4_CMD_M,
-- 
2.8.1

Re: [PATCH v2 for-next] RDMA/hns: Initialize all fields of doorbells to zero

[Jason Gunthorpe]

On Thu, Feb 20, 2020 at 09:34:31AM +0800, Weihang Li wrote:
> From: Lang Cheng <chenglang@huawei.com>
> 
> Prevent uninitialized fields when new fields are added, and make code
> look simpler.
> 
> Signed-off-by: Lang Cheng <chenglang@huawei.com>
> Signed-off-by: Weihang Li <liweihang@huawei.com>
> ---
> Changes since v1:
> - Just rebase against the for-next branch.
> 
>  drivers/infiniband/hw/hns/hns_roce_hw_v1.c | 9 ++-------
>  drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 5 +----
>  2 files changed, 3 insertions(+), 11 deletions(-)

Applied to for-next, thanks

Jason