linux-kernel - [PATCH AUTOSEL 6.1 3/9] drm/sti: hdmi: use eld_mutex to protect access to connector->eld

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Message-Id: <20250126145651.943149-3-sashal@kernel.org>
Date: Sun, 26 Jan 2025 09:56:45 -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>,
	Raphael Gallais-Pou <rgallaispou@...il.com>,
	Sasha Levin <sashal@...nel.org>,
	alain.volmat@...s.st.com,
	maarten.lankhorst@...ux.intel.com,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.1 3/9] drm/sti: hdmi: use eld_mutex to protect access to connector->eld

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

[ Upstream commit e99c0b517bcd53cf61f998a3c4291333401cb391 ]

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>
Acked-by: Raphael Gallais-Pou <rgallaispou@...il.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241206-drm-connector-eld-mutex-v2-9-c9bce1ee8bea@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/sti/sti_hdmi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index 8539fe1fedc4c..fdb28e05720ad 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -1220,7 +1220,9 @@ static int hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf, size
 	struct drm_connector *connector = hdmi->drm_connector;
 
 	DRM_DEBUG_DRIVER("\n");
+	mutex_lock(&connector->eld_mutex);
 	memcpy(buf, connector->eld, min(sizeof(connector->eld), len));
+	mutex_unlock(&connector->eld_mutex);
 
 	return 0;
 }
-- 
2.39.5