Re: [PATCH rdma-next 1/2] RDMA/mlx5: Fix return value from mlx5_ib_modify_cq()

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On Tue, Jul 31, 2018 at 09:02:36AM +0300, Kamal Heib wrote:
> The proper return code is "-EOPNOTSUPP" when the modify_cq() callback
> is not supported.
> 
> Signed-off-by: Kamal Heib <kamalheib1@xxxxxxxxx>
>  drivers/infiniband/hw/mlx5/cq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/hw/mlx5/cq.c b/drivers/infiniband/hw/mlx5/cq.c
> index ad39d64b8108..088205d7f1a1 100644
> +++ b/drivers/infiniband/hw/mlx5/cq.c
> @@ -1184,7 +1184,7 @@ int mlx5_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
>  	int err;
>  
>  	if (!MLX5_CAP_GEN(dev->mdev, cq_moderation))
> -		return -ENOSYS;
> +		return -EOPNOTSUPP;

I'm going to apply this anyhow, since it is clearly wrong as is..

But what I would prefer to see is for the modify_cq pointer be NULL if
the driver's HW/FW will not support modify_cq.

This will tie in better with the uapi introspection feature I'm contemplating.

Thanks,
Jason
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