[PATCH] drm/amd/display: Fix memory leaks in S3 resume

[Deucher, Alexander]

[AMD Official Use Only - Internal Distribution Only]

Lee Starnes just sent the exact same patch yesterday.  Please review that one:
https://patchwork.freedesktop.org/patch/399497/

Alex

________________________________
From: Wentland, Harry <Harry.Wentland at amd.com>
Sent: Tuesday, November 10, 2020 9:27 AM
To: Wang, Chao-kai (Stylon) <Stylon.Wang at amd.com>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Cc: Kazlauskas, Nicholas <Nicholas.Kazlauskas at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>
Subject: Re: [PATCH] drm/amd/display: Fix memory leaks in S3 resume

On 2020-11-10 2:49 a.m., Stylon Wang wrote:
> EDID parsing in S3 resume pushes new display modes
> to probed_modes list but doesn't consolidate to actual
> mode list. This creates a race condition when
> amdgpu_dm_connector_ddc_get_modes() re-initializes the
> list head without walking the list and results in  memory leak.
>
> Signed-off-by: Stylon Wang <stylon.wang at amd.com>

Looks reasonable to me but haven't had a chance to understand whether
this is the best solution.

Acked-by: Harry Wentland <harry.wentland at amd.com>

Harry

> ---
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 0b6adf23d316..715e0bd489f8 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -2337,7 +2337,8 @@ void amdgpu_dm_update_connector_after_detect(
>
>                        drm_connector_update_edid_property(connector,
>                                                           aconnector->edid);
> -                     drm_add_edid_modes(connector, aconnector->edid);
> +                     aconnector->num_modes = drm_add_edid_modes(connector, aconnector->edid);
> +                     drm_connector_list_update(connector);
>
>                        if (aconnector->dc_link->aux_mode)
>                                drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
>
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