Re: [PATCH] IB/mlx4: Rework special QP creation error path

[Laurence Oberman <loberman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

----- Original Message -----
> From: "Bart Van Assche" <bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
> To: "Doug Ledford" <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> Cc: "Yishai Hadas" <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> Sent: Monday, November 14, 2016 11:44:11 AM
> Subject: [PATCH] IB/mlx4: Rework special QP creation error path
> 
> The special QP creation error path relies on offset_of(struct mlx4_ib_sqp,
> qp) == 0. Remove this assumption because that makes the QP creation
> code easier to understand.
> 
> Signed-off-by: Bart Van Assche <bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
> Cc: Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> ---
>  drivers/infiniband/hw/mlx4/qp.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mlx4/qp.c
> b/drivers/infiniband/hw/mlx4/qp.c
> index 570bc86..b63d6be 100644
> --- a/drivers/infiniband/hw/mlx4/qp.c
> +++ b/drivers/infiniband/hw/mlx4/qp.c
> @@ -644,7 +644,7 @@ static int create_qp_common(struct mlx4_ib_dev *dev,
> struct ib_pd *pd,
>  	int qpn;
>  	int err;
>  	struct ib_qp_cap backup_cap;
> -	struct mlx4_ib_sqp *sqp;
> +	struct mlx4_ib_sqp *sqp = NULL;
>  	struct mlx4_ib_qp *qp;
>  	enum mlx4_ib_qp_type qp_type = (enum mlx4_ib_qp_type) init_attr->qp_type;
>  	struct mlx4_ib_cq *mcq;
> @@ -933,7 +933,9 @@ static int create_qp_common(struct mlx4_ib_dev *dev,
> struct ib_pd *pd,
>  		mlx4_db_free(dev->dev, &qp->db);
>  
>  err:
> -	if (!*caller_qp)
> +	if (sqp)
> +		kfree(sqp);
> +	else if (!*caller_qp)
>  		kfree(qp);
>  	return err;
>  }
> --
> 2.10.1
> 
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> 
This looks fine to me.

Reviewed-by: Laurence Oberman <loberman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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