Re: [PATCH] drm/amd/display: Check return value of drm helper

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On Tue, Jan 7, 2020 at 11:41 AM <mikita.lipski@xxxxxxx> wrote:
>
> From: Mikita Lipski <mikita.lipski@xxxxxxx>
>
> If driver fails to update update VCPI allocation during
> compute_mst_dsc_configs_for_state - fail the function
> by early return.
>
> Signed-off-by: Mikita Lipski <mikita.lipski@xxxxxxx>

Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>

> ---
>  .../display/amdgpu_dm/amdgpu_dm_mst_types.c   | 99 ++++++++++---------
>  1 file changed, 54 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index 35c8b1469f4c..7911c5dac424 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -621,37 +621,41 @@ static void increase_dsc_bpp(struct drm_atomic_state *state,
>
>                 if (initial_slack[next_index] > fair_pbn_alloc) {
>                         vars[next_index].pbn += fair_pbn_alloc;
> -                       drm_dp_atomic_find_vcpi_slots(state,
> -                                                     params[next_index].port->mgr,
> -                                                     params[next_index].port,
> -                                                     vars[next_index].pbn,
> -                                                     dm_mst_get_pbn_divider(dc_link));
> +                       if (drm_dp_atomic_find_vcpi_slots(state,
> +                                                         params[next_index].port->mgr,
> +                                                         params[next_index].port,
> +                                                         vars[next_index].pbn,\
> +                                                         dm_mst_get_pbn_divider(dc_link)) < 0)
> +                               return;
>                         if (!drm_dp_mst_atomic_check(state)) {
>                                 vars[next_index].bpp_x16 = bpp_x16_from_pbn(params[next_index], vars[next_index].pbn);
>                         } else {
>                                 vars[next_index].pbn -= fair_pbn_alloc;
> -                               drm_dp_atomic_find_vcpi_slots(state,
> -                                                     params[next_index].port->mgr,
> -                                                     params[next_index].port,
> -                                                     vars[next_index].pbn,
> -                                                     dm_mst_get_pbn_divider(dc_link));
> +                               if (drm_dp_atomic_find_vcpi_slots(state,
> +                                                                 params[next_index].port->mgr,
> +                                                                 params[next_index].port,
> +                                                                 vars[next_index].pbn,
> +                                                                 dm_mst_get_pbn_divider(dc_link)) < 0)
> +                                       return;
>                         }
>                 } else {
>                         vars[next_index].pbn += initial_slack[next_index];
> -                       drm_dp_atomic_find_vcpi_slots(state,
> -                                                     params[next_index].port->mgr,
> -                                                     params[next_index].port,
> -                                                     vars[next_index].pbn,
> -                                                     dm_mst_get_pbn_divider(dc_link));
> +                       if (drm_dp_atomic_find_vcpi_slots(state,
> +                                                         params[next_index].port->mgr,
> +                                                         params[next_index].port,
> +                                                         vars[next_index].pbn,
> +                                                         dm_mst_get_pbn_divider(dc_link)) < 0)
> +                               return;
>                         if (!drm_dp_mst_atomic_check(state)) {
>                                 vars[next_index].bpp_x16 = params[next_index].bw_range.max_target_bpp_x16;
>                         } else {
>                                 vars[next_index].pbn -= initial_slack[next_index];
> -                               drm_dp_atomic_find_vcpi_slots(state,
> -                                                     params[next_index].port->mgr,
> -                                                     params[next_index].port,
> -                                                     vars[next_index].pbn,
> -                                                     dm_mst_get_pbn_divider(dc_link));
> +                               if (drm_dp_atomic_find_vcpi_slots(state,
> +                                                                 params[next_index].port->mgr,
> +                                                                 params[next_index].port,
> +                                                                 vars[next_index].pbn,
> +                                                                 dm_mst_get_pbn_divider(dc_link)) < 0)
> +                                       return;
>                         }
>                 }
>
> @@ -700,22 +704,24 @@ static void try_disable_dsc(struct drm_atomic_state *state,
>                         break;
>
>                 vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.stream_kbps);
> -               drm_dp_atomic_find_vcpi_slots(state,
> -                                             params[next_index].port->mgr,
> -                                             params[next_index].port,
> -                                             vars[next_index].pbn,
> -                                             0);
> +               if (drm_dp_atomic_find_vcpi_slots(state,
> +                                                 params[next_index].port->mgr,
> +                                                 params[next_index].port,
> +                                                 vars[next_index].pbn,
> +                                                 0) < 0)
> +                       return;
>
>                 if (!drm_dp_mst_atomic_check(state)) {
>                         vars[next_index].dsc_enabled = false;
>                         vars[next_index].bpp_x16 = 0;
>                 } else {
>                         vars[next_index].pbn = kbps_to_peak_pbn(params[next_index].bw_range.max_kbps);
> -                       drm_dp_atomic_find_vcpi_slots(state,
> -                                             params[next_index].port->mgr,
> -                                             params[next_index].port,
> -                                             vars[next_index].pbn,
> -                                             dm_mst_get_pbn_divider(dc_link));
> +                       if (drm_dp_atomic_find_vcpi_slots(state,
> +                                                         params[next_index].port->mgr,
> +                                                         params[next_index].port,
> +                                                         vars[next_index].pbn,
> +                                                         dm_mst_get_pbn_divider(dc_link)) < 0)
> +                               return;
>                 }
>
>                 tried[next_index] = true;
> @@ -769,11 +775,12 @@ static bool compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
>                 vars[i].pbn = kbps_to_peak_pbn(params[i].bw_range.stream_kbps);
>                 vars[i].dsc_enabled = false;
>                 vars[i].bpp_x16 = 0;
> -               drm_dp_atomic_find_vcpi_slots(state,
> -                                             params[i].port->mgr,
> -                                             params[i].port,
> -                                             vars[i].pbn,
> -                                             0);
> +               if (drm_dp_atomic_find_vcpi_slots(state,
> +                                                params[i].port->mgr,
> +                                                params[i].port,
> +                                                vars[i].pbn,
> +                                                0) < 0)
> +                       return false;
>         }
>         if (!drm_dp_mst_atomic_check(state)) {
>                 set_dsc_configs_from_fairness_vars(params, vars, count);
> @@ -786,20 +793,22 @@ static bool compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
>                         vars[i].pbn = kbps_to_peak_pbn(params[i].bw_range.min_kbps);
>                         vars[i].dsc_enabled = true;
>                         vars[i].bpp_x16 = params[i].bw_range.min_target_bpp_x16;
> -                       drm_dp_atomic_find_vcpi_slots(state,
> -                                             params[i].port->mgr,
> -                                             params[i].port,
> -                                             vars[i].pbn,
> -                                             dm_mst_get_pbn_divider(dc_link));
> +                       if (drm_dp_atomic_find_vcpi_slots(state,
> +                                                         params[i].port->mgr,
> +                                                         params[i].port,
> +                                                         vars[i].pbn,
> +                                                         dm_mst_get_pbn_divider(dc_link)) < 0)
> +                               return false;
>                 } else {
>                         vars[i].pbn = kbps_to_peak_pbn(params[i].bw_range.stream_kbps);
>                         vars[i].dsc_enabled = false;
>                         vars[i].bpp_x16 = 0;
> -                       drm_dp_atomic_find_vcpi_slots(state,
> -                                             params[i].port->mgr,
> -                                             params[i].port,
> -                                             vars[i].pbn,
> -                                             0);
> +                       if (drm_dp_atomic_find_vcpi_slots(state,
> +                                                         params[i].port->mgr,
> +                                                         params[i].port,
> +                                                         vars[i].pbn,
> +                                                         0) < 0)
> +                               return false;
>                 }
>         }
>         if (drm_dp_mst_atomic_check(state))
> --
> 2.17.1
>
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