Re: [PATCH] drm/dp_mst: Fix drm_dp_mst_topology.c selftest compilation warning

[Alex Deucher]

On Mon, Apr 13, 2020 at 5:29 AM Tang Bin <tangbin@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> The struct drm_dp_desc contains struct drm_dp_dpcd_ident, and the struct
> drm_dp_dpcd_ident contains the array, so zero-initialization requires a
> more couple of braces. In the ARM compiler environment, the compile
> warning pointing it out:
>     drivers/gpu/drm/drm_dp_mst_topology.c: In function 'drm_dp_mst_dsc_aux_for_port':
>     drivers/gpu/drm/drm_dp_mst_topology.c:5494:9: warning: missing braces around initializer [-Wmissing-braces]
>       struct drm_dp_desc desc = { 0 };
>

This seems to vary based on compilers.  Maybe a memset would be better.

Alex

> Signed-off-by: Tang Bin <tangbin@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Shengju Zhang <zhangshengju@xxxxxxxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 70c4b7a..4d8d1fd 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -5494,7 +5494,7 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
>  {
>         struct drm_dp_mst_port *immediate_upstream_port;
>         struct drm_dp_mst_port *fec_port;
> -       struct drm_dp_desc desc = { 0 };
> +       struct drm_dp_desc desc = { { { 0 } } };
>         u8 endpoint_fec;
>         u8 endpoint_dsc;
>
> --
> 2.7.4
>
>
>
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