On Sun, May 30, 2021 at 09:32:14AM +0300, Eli Cohen wrote:
> umem size is a 32 bit unsigned value so assigning it to an int could
> cause false failures. Set the calculated value inside the function and
> modify function name to reflect the fact it updates the size.
>
> Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices")
> Signed-off-by: Eli Cohen <[email protected]>
could you clarify the impact of the bug please?
> ---
> drivers/vdpa/mlx5/net/mlx5_vnet.c | 15 +++++----------
> 1 file changed, 5 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 53312f0460ad..fdf3e74bffbd 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -610,8 +610,8 @@ static void cq_destroy(struct mlx5_vdpa_net *ndev, u16
> idx)
> mlx5_db_free(ndev->mvdev.mdev, &vcq->db);
> }
>
> -static int umem_size(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue
> *mvq, int num,
> - struct mlx5_vdpa_umem **umemp)
> +static void set_umem_size(struct mlx5_vdpa_net *ndev, struct
> mlx5_vdpa_virtqueue *mvq, int num,
> + struct mlx5_vdpa_umem **umemp)
> {
> struct mlx5_core_dev *mdev = ndev->mvdev.mdev;
> int p_a;
> @@ -634,7 +634,7 @@ static int umem_size(struct mlx5_vdpa_net *ndev, struct
> mlx5_vdpa_virtqueue *mvq
> *umemp = &mvq->umem3;
> break;
> }
> - return p_a * mvq->num_ent + p_b;
> + (*umemp)->size = p_a * mvq->num_ent + p_b;
> }
>
> static void umem_frag_buf_free(struct mlx5_vdpa_net *ndev, struct
> mlx5_vdpa_umem *umem)
> @@ -650,15 +650,10 @@ static int create_umem(struct mlx5_vdpa_net *ndev,
> struct mlx5_vdpa_virtqueue *m
> void *in;
> int err;
> __be64 *pas;
> - int size;
> struct mlx5_vdpa_umem *umem;
>
> - size = umem_size(ndev, mvq, num, &umem);
> - if (size < 0)
> - return size;
> -
> - umem->size = size;
> - err = umem_frag_buf_alloc(ndev, umem, size);
> + set_umem_size(ndev, mvq, num, &umem);
> + err = umem_frag_buf_alloc(ndev, umem, umem->size);
> if (err)
> return err;
>
> --
> 2.31.1
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