From: Dmitry Baryshkov dmitry.baryshkov@linaro.org
[ Upstream commit 39ead6e02ea7d19b421e9d42299d4293fed3064e ]
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/bridge/ite-it66121.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c index 8f5846b76d594..2381cd1cba879 100644 --- a/drivers/gpu/drm/bridge/ite-it66121.c +++ b/drivers/gpu/drm/bridge/ite-it66121.c @@ -1452,8 +1452,10 @@ static int it66121_audio_get_eld(struct device *dev, void *data, dev_dbg(dev, "No connector present, passing empty EDID data"); memset(buf, 0, len); } else { + mutex_lock(&ctx->connector->eld_mutex); memcpy(buf, ctx->connector->eld, min(sizeof(ctx->connector->eld), len)); + mutex_unlock(&ctx->connector->eld_mutex); } mutex_unlock(&ctx->lock);