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

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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@xxxxxxx>

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

Acked-by: Harry Wentland <harry.wentland@xxxxxxx>

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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