From: Yevgeny Kliteynik <kliteyn@mellanox.com>
Date: Wed, 8 Nov 2017 16:07:17 +0000 (+0200)
Subject: net/mlx5: FPGA, Abort FPGA init if the device reports no QP capability
X-Git-Tag: v4.18-rc1~114^2~94^2~3
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=90275d809ab982a7fdc1f2ed5b0fe3e4c55a5257;p=thirdparty%2Fkernel%2Flinux.git

net/mlx5: FPGA, Abort FPGA init if the device reports no QP capability

In the case that the reported max number of QPs capability
equals to zero, abort FPGA init.

Signed-off-by: Yevgeny Kliteynik <kliteyn@mellanox.com>
Signed-off-by: Adi Nissim <adin@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
---

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c b/drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c
index 02319f779a49f..26caa0475985c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fpga/core.c
@@ -170,6 +170,12 @@ int mlx5_fpga_device_start(struct mlx5_core_dev *mdev)
 		       MLX5_CAP_FPGA(fdev->mdev, sandbox_product_version));
 
 	max_num_qps = MLX5_CAP_FPGA(mdev, shell_caps.max_num_qps);
+	if (!max_num_qps) {
+		mlx5_fpga_err(fdev, "FPGA reports 0 QPs in SHELL_CAPS\n");
+		err = -ENOTSUPP;
+		goto out;
+	}
+
 	err = mlx5_core_reserve_gids(mdev, max_num_qps);
 	if (err)
 		goto out;