From c47b170b024060e1b62ba211fe6fcd66fb36af4a Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 2 Dec 2019 14:22:55 +0000
Subject: [PATCH] mlx5: Do not try to enable fwdumps if scan space did not
 responded.

Sponsored by:	Mellanox Technologies
MFC after:	1 week
---
 sys/dev/mlx5/mlx5_core/mlx5_fwdump.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/dev/mlx5/mlx5_core/mlx5_fwdump.c b/sys/dev/mlx5/mlx5_core/mlx5_fwdump.c
index 37faa46d4c19..622ea7ae0cdb 100644
--- a/sys/dev/mlx5/mlx5_core/mlx5_fwdump.c
+++ b/sys/dev/mlx5/mlx5_core/mlx5_fwdump.c
@@ -111,6 +111,10 @@ mlx5_fwdump_prep(struct mlx5_core_dev *mdev)
 			sz++;
 		addr = next_addr;
 	}
+	if (sz == 1) {
+		mlx5_core_warn(mdev, "no output from scan space\n");
+		goto unlock_vsc;
+	}
 	mdev->dump_rege = malloc(sz * sizeof(struct mlx5_crspace_regmap),
 	    M_MLX5_DUMP, M_WAITOK | M_ZERO);