diff mbox series

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

Message ID 20241206-drm-connector-eld-mutex-v2-4-c9bce1ee8bea@linaro.org (mailing list archive)
State Not Applicable
Headers show
Series drm/connector: add eld_mutex to protect connector->eld | expand

Commit Message

Dmitry Baryshkov Dec. 6, 2024, 9:43 a.m. UTC 
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 <mripard@kernel.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Dmitry Baryshkov Dec. 10, 2024, 9:20 p.m. UTC | #1 
On Fri, Dec 06, 2024 at 11:43:07AM +0200, Dmitry Baryshkov wrote:
> 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 <mripard@kernel.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
>  1 file changed, 2 insertions(+)

Harry, Leo, Rodrigo, Alex, Christian, Xinhui, any response to this one
and to the radeon patches? I'd like to be able to pick the series for
drm-misc and these two are not reviewed by you.

> 
> 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
>
diff mbox series

Patch

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;
 	}