From: Dmitry Baryshkov dmitry.baryshkov@linaro.org
[ Upstream commit b54c14f82428c8a602392d4cae1958a71a578132 ]
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-mut... Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/radeon/radeon_audio.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_audio.c b/drivers/gpu/drm/radeon/radeon_audio.c index fc22fe709b9c1..da37a827337bc 100644 --- a/drivers/gpu/drm/radeon/radeon_audio.c +++ b/drivers/gpu/drm/radeon/radeon_audio.c @@ -773,8 +773,10 @@ 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; }