linux-kernel - [PATCH AUTOSEL 6.13 16/34] drm/bridge: ite-it66121: use eld_mutex to protect access to connector->eld

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Message-Id: <20250126145310.926311-16-sashal@kernel.org>
Date: Sun, 26 Jan 2025 09:52:52 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Maxime Ripard <mripard@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	ple@...libre.com,
	neil.armstrong@...aro.org,
	andrzej.hajda@...el.com,
	rfoss@...nel.org,
	maarten.lankhorst@...ux.intel.com,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.13 16/34] drm/bridge: ite-it66121: use eld_mutex to protect access to connector->eld

From: Dmitry Baryshkov <dmitry.baryshkov@...aro.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@...nel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241206-drm-connector-eld-mutex-v2-3-c9bce1ee8bea@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 35ae3f0e8f51f..940083e5d2ddb 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