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drm/bridge: ite-it66121: use eld_mutex to protect access to connector->eld

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[ Upstream commit 39ead6e02e ]

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@kernel.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@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dmitry Baryshkov
2024-12-06 11:43:06 +02:00
committed by Greg Kroah-Hartman
parent ad8870a647
commit d698cbfef6
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/bridge/ite-it66121.c
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@@ -1452,8 +1452,10 @@ static int it66121_audio_get_eld(struct device *dev, void *data,
dev_dbg(dev, "No connector present, passing empty EDID data"); dev_dbg(dev, "No connector present, passing empty EDID data");
memset(buf, 0, len); memset(buf, 0, len);
} else { } else {
mutex_lock(&ctx->connector->eld_mutex);
memcpy(buf, ctx->connector->eld, memcpy(buf, ctx->connector->eld,
min(sizeof(ctx->connector->eld), len)); min(sizeof(ctx->connector->eld), len));
mutex_unlock(&ctx->connector->eld_mutex);
} }
mutex_unlock(&ctx->lock); mutex_unlock(&ctx->lock);