[PATCH 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.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at 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 a599fc5d63c524474276f5db98b05c7c512f332a..61952a0c49861efcb5e7c0884fcb85c040daf9ce 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 dp_audio_get_eld(struct device *dev,
 		return -ENODEV;
 	}
 
+	mutex_lock(&dp_display->connector->eld_mutex);
 	memcpy(buf, dp_display->connector->eld,
 		min(sizeof(dp_display->connector->eld), len));
+	mutex_unlock(&dp_display->connector->eld_mutex);
 
 	return 0;
 }

-- 
2.39.5