[PATCH 4.19 89/91] RDMA/mlx5: Fix NULL string error

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Shay Drory <shayd@xxxxxxxxxx>

commit dab994bcc609a172bfdab15a0d4cb7e50e8b5458 upstream.

checkpath is complaining about NULL string, change it to 'Unknown'.

Fixes: 37aa5c36aa70 ("IB/mlx5: Add UARs write-combining and non-cached mapping")
Signed-off-by: Shay Drory <shayd@xxxxxxxxxx>
Link: https://lore.kernel.org/r/8638e5c14fadbde5fa9961874feae917073af920.1695203958.git.leonro@xxxxxxxxxx
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/infiniband/hw/mlx5/main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -2005,7 +2005,7 @@ static inline char *mmap_cmd2str(enum ml
 	case MLX5_IB_MMAP_DEVICE_MEM:
 		return "Device Memory";
 	default:
-		return NULL;
+		return "Unknown";
 	}
 }
 





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