From 571b8b92c7d4cddd899cf19f11f14fb149968898 Mon Sep 17 00:00:00 2001 From: Jack Morgenstein Date: Thu, 7 Nov 2013 12:19:50 +0200 Subject: net/mlx4_core: Initialize all mailbox buffers to zero before use To guarantee that all unused fields in all FW commands for both inboxes and outboxes are zeroed out, initialize the mailbox buffer to all zeroes. This is especially important for SRIOV comm-channel virtual commands (such as QUERY_FUNC_CAP), where if new fields are added to support new features, the driver can depend on older kernels passing zeroes in these fields. In addition to zeroing out the mailbox buffer at allocation time, all (now unnecessary) calls to memset by the callers of mlx4_alloc_cmd_mailbox() are removed. Signed-off-by: Majd Dibbiny Signed-off-by: Jack Morgenstein Signed-off-by: Amir Vadai Signed-off-by: David S. Miller --- drivers/infiniband/hw/mlx4/main.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'drivers/infiniband/hw/mlx4') diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c index 7567437dbd34..6a0a0d29660d 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -526,7 +526,6 @@ static int mlx4_ib_modify_device(struct ib_device *ibdev, int mask, if (IS_ERR(mailbox)) return 0; - memset(mailbox->buf, 0, 256); memcpy(mailbox->buf, props->node_desc, 64); mlx4_cmd(to_mdev(ibdev)->dev, mailbox->dma, 1, 0, MLX4_CMD_SET_NODE, MLX4_CMD_TIME_CLASS_A, MLX4_CMD_NATIVE); @@ -547,8 +546,6 @@ static int mlx4_SET_PORT(struct mlx4_ib_dev *dev, u8 port, int reset_qkey_viols, if (IS_ERR(mailbox)) return PTR_ERR(mailbox); - memset(mailbox->buf, 0, 256); - if (dev->dev->flags & MLX4_FLAG_OLD_PORT_CMDS) { *(u8 *) mailbox->buf = !!reset_qkey_viols << 6; ((__be32 *) mailbox->buf)[2] = cpu_to_be32(cap_mask); @@ -879,8 +876,6 @@ static int __mlx4_ib_create_flow(struct ib_qp *qp, struct ib_flow_attr *flow_att struct mlx4_ib_dev *mdev = to_mdev(qp->device); struct mlx4_cmd_mailbox *mailbox; struct mlx4_net_trans_rule_hw_ctrl *ctrl; - size_t rule_size = sizeof(struct mlx4_net_trans_rule_hw_ctrl) + - (sizeof(struct _rule_hw) * flow_attr->num_of_specs); static const u16 __mlx4_domain[] = { [IB_FLOW_DOMAIN_USER] = MLX4_DOMAIN_UVERBS, @@ -905,7 +900,6 @@ static int __mlx4_ib_create_flow(struct ib_qp *qp, struct ib_flow_attr *flow_att mailbox = mlx4_alloc_cmd_mailbox(mdev->dev); if (IS_ERR(mailbox)) return PTR_ERR(mailbox); - memset(mailbox->buf, 0, rule_size); ctrl = mailbox->buf; ctrl->prio = cpu_to_be16(__mlx4_domain[domain] | -- cgit v1.2.3