drm/radeon: use eld_mutex to protect access to connector->eld

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>
Link: https://patchwork.freedesktop.org/patch/msgid/20241206-drm-connector-eld-mutex-v2-8-c9bce1ee8bea@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

diff --git a/drivers/gpu/drm/radeon/radeon_audio.c b/drivers/gpu/drm/radeon/radeon_audio.c
index 5b69cc8011b42b4686c02f97a2b451a63d6c346d..8d64ba18572ec4bb6f6985be3a5edf581c47d7a3 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_audio.c
+++ b/drivers/gpu/drm/radeon/radeon_audio.c
@@ -775,8 +775,10 @@ static int radeon_audio_component_get_eld(struct device *kdev, int port,
                if (!dig->pin || dig->pin->id != 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;
        }