[PATCH v2 03/10] drm/bridge: ite-it66121: 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/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 
35ae3f0e8f51f768229e055a086b53a419ffcd9f..940083e5d2ddbfc56f14e2bdc6ddd0b9dd50b1f8
 100644
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -1450,8 +1450,10 @@ 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);
 

-- 
2.39.5