From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7E406201271; Sun, 26 Jan 2025 14:57:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737903441; cv=none; b=O1LsjP8GQXknMcuqgCohlf0nLNaAymoql37sxiqD1JiDsds6zLkHyaJdWsz255Nqw910c3iECSzwgoMZ15rmuve1XfgdGhcHvC2G8CfnAkEHAeey6lSiqh75BssBPfA26yRfvRPeohNfEL+hj5kHBgelGl0ymhigqxsCFIhw97Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737903441; c=relaxed/simple; bh=Ojtx9cnNhIZFkkBxjxd7X5B5RT1T88qxeLuQRJvKuHM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=O68TaClmz2nwMsl7QLXPAklo12d+OgnkorNzy79Qu7j4gAiYKpVOfYGHgrpkE5AiAQDsjKZhv6oTMY3BNUCu3L0JmcF+c+gI6Ue4wAnLMXqUSFRznRAcPzBPjgYS5Xcm1+l9kyfy9U8l4tdoueoRdMcO2j6K56TkWaku9a+aM1A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=n9D8K5fd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="n9D8K5fd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 172C0C4CED3; Sun, 26 Jan 2025 14:57:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737903441; bh=Ojtx9cnNhIZFkkBxjxd7X5B5RT1T88qxeLuQRJvKuHM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=n9D8K5fdblHvHuKbKff/rTdig7iXWquiGj52RF/k05Comn8LmO/qNRIVJ1eWhcaNK HxPFAQMYZgeVKZ2xpUSo4xgGHd+EgyxHh49pEftY6NSH9NiroINAAKuIA6VxIQT/h2 ia+m7iMEHZg1z4eWqOKo9ytNax7krRi25NGJiy1PpbgAqReMXFWoPcs0uczWypFJ48 7FqqXm31ELEuMGbIwwGisq5M7MUPLgWe3X4OXh2opC363B9iASYLI3FNjHygbrHnY4 E5ls979KE0ZxF57829bS0Qsd2n+YHTPwXwzDGt9qxlmeNMq0HILb7c06UgeuYMDYSo WhN+9bbQUsYcg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dmitry Baryshkov , Maxime Ripard , Raphael Gallais-Pou , Sasha Levin , alain.volmat@foss.st.com, maarten.lankhorst@linux.intel.com, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.10 2/3] drm/sti: hdmi: use eld_mutex to protect access to connector->eld Date: Sun, 26 Jan 2025 09:57:16 -0500 Message-Id: <20250126145717.946866-2-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250126145717.946866-1-sashal@kernel.org> References: <20250126145717.946866-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.10.233 Content-Transfer-Encoding: 8bit From: Dmitry Baryshkov [ 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 Acked-by: Raphael Gallais-Pou Link: https://patchwork.freedesktop.org/patch/msgid/20241206-drm-connector-eld-mutex-v2-9-c9bce1ee8bea@linaro.org Signed-off-by: Dmitry Baryshkov Signed-off-by: Sasha Levin --- 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 1bcee73f51144..f5dd2aca097a7 100644 --- a/drivers/gpu/drm/sti/sti_hdmi.c +++ b/drivers/gpu/drm/sti/sti_hdmi.c @@ -1213,7 +1213,9 @@ 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