linux-kernel - [PATCH rdma-next] RDMA/mlx4: Return missed an error if device doesn't support steering

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Message-Id: <91c61f6e60eb0240f8bbc321fda7a1d2986dd03c.1634023677.git.leonro@nvidia.com>
Date:   Tue, 12 Oct 2021 10:28:43 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     Leon Romanovsky <leonro@...dia.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Yishai Hadas <yishaih@...dia.com>
Subject: [PATCH rdma-next] RDMA/mlx4: Return missed an error if device doesn't support steering

From: Leon Romanovsky <leonro@...dia.com>

The error flow fixed in this patch is not possible because all kernel
users of create QP interface check that device supports steering before
set IB_QP_CREATE_NETIF_QP flag.

Fixes: c1c98501121e ("IB/mlx4: Add support for steerable IB UD QPs")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/infiniband/hw/mlx4/qp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 8662f462e2a5..3a1a4ac9dd33 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -1099,8 +1099,10 @@ static int create_qp_common(struct ib_pd *pd, struct ib_qp_init_attr *init_attr,
 			if (dev->steering_support ==
 			    MLX4_STEERING_MODE_DEVICE_MANAGED)
 				qp->flags |= MLX4_IB_QP_NETIF;
-			else
+			else {
+				err = -EINVAL;
 				goto err;
+			}
 		}
 
 		err = set_kernel_sq_size(dev, &init_attr->cap, qp_type, qp);
-- 
2.31.1