[PATCH v2 04/10] drm/amd/display: use eld_mutex to protect access to connector->eld

[Dmitry Baryshkov]

Reading access to connector->eld can happen at the same time the
drm_edid_to_eld() updates the data. Take the newly added eld_mutex in
order to protect connector->eld from concurrent access.

Reviewed-by: Maxime Ripard <mrip...@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
 1 file changed, 2 insertions(+)

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 
19a58630e774029767bf2a27eb4ddf17e3c21129..04c68c320252b5ce9647f0606fb86fe57f347639
 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1037,8 +1037,10 @@ static int amdgpu_dm_audio_component_get_eld(struct 
device *kdev, int port,
                        continue;
 
                *enabled = true;
+               mutex_lock(&connector->eld_mutex);
                ret = drm_eld_size(connector->eld);
                memcpy(buf, connector->eld, min(max_bytes, ret));
+               mutex_unlock(&connector->eld_mutex);
 
                break;
        }

-- 
2.39.5