[PATCH v2 07/10] drm/msm/dp: 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>
Acked-by: Abhinav Kumar <quic_abhin...@quicinc.com>
Reviewed-by: Abhinav Kumar <quic_abhin...@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_audio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_audio.c 
b/drivers/gpu/drm/msm/dp/dp_audio.c
index 
74e01a5dd4195d5e0e04250663886f1116f25711..0fd5e0abaf07828157085bd680bfd3c7d32deb61
 100644
--- a/drivers/gpu/drm/msm/dp/dp_audio.c
+++ b/drivers/gpu/drm/msm/dp/dp_audio.c
@@ -414,8 +414,10 @@ static int msm_dp_audio_get_eld(struct device *dev,
                return -ENODEV;
        }
 
+       mutex_lock(&msm_dp_display->connector->eld_mutex);
        memcpy(buf, msm_dp_display->connector->eld,
                min(sizeof(msm_dp_display->connector->eld), len));
+       mutex_unlock(&msm_dp_display->connector->eld_mutex);
 
        return 0;
 }

-- 
2.39.5