linux-kernel - [PATCH AUTOSEL 6.6 04/17] drm/bridge: anx7625: use eld_mutex to protect access to connector->eld

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Message-Id: <20250126145612.937679-4-sashal@kernel.org>
Date: Sun, 26 Jan 2025 09:55:59 -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>,
	andrzej.hajda@...el.com,
	neil.armstrong@...aro.org,
	rfoss@...nel.org,
	maarten.lankhorst@...ux.intel.com,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	dianders@...omium.org,
	laurent.pinchart@...asonboard.com,
	jani.nikula@...el.com,
	nfraprado@...labora.com,
	u.kleine-koenig@...libre.com,
	sui.jingfeng@...ux.dev,
	xji@...logixsemi.com,
	yuanhsinte@...omium.org,
	robh@...nel.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.6 04/17] drm/bridge: anx7625: use eld_mutex to protect access to connector->eld

From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

[ Upstream commit e72bf423a60afd744d13e40ab2194044a3af5217 ]

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-v2-2-c9bce1ee8bea@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 412c6575e87b7..ddf944651c55a 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -2014,8 +2014,10 @@ static int anx7625_audio_get_eld(struct device *dev, void *data,
 		memset(buf, 0, len);
 	} else {
 		dev_dbg(dev, "audio copy eld\n");
+		mutex_lock(&ctx->connector->eld_mutex);
 		memcpy(buf, ctx->connector->eld,
 		       min(sizeof(ctx->connector->eld), len));
+		mutex_unlock(&ctx->connector->eld_mutex);
 	}
 
 	return 0;
-- 
2.39.5