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 17351201103; Sun, 26 Jan 2025 14:57:15 +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=1737903438; cv=none; b=kUD2yDjddTnBQUgrgIJc3VVU/0jGNix8bB2RRkYLhYeMBOs3se196W0AKBnUQ+AYHM+8NuD8228uSk/JSgBrX6AxPQY0VmJZEbmEN14wT/cq4yWv5OQvZSaCgF444Fn//Ybr1p2jwVacEn4VttTXp9GPQNUYW0Gyln5CvqNPX6o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737903438; c=relaxed/simple; bh=Hp9DZrCKjPM+6PwiDNFCOHJ/yx2WVOqIMsJwOuCGVSQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=emad55gqWtZijEB2NVADJAdDO7I8cCsRD4ZrDfD7Q1/zLA8DC1AoOyJjHednWdz19NfjScAwWfeBcjgzF1ItHERaG7vvvUq6pxpsKyKzTOiJjkmtClqAcCjIL3oomb2SnKMM9PMj5jPxzCkOBRiClKyLxXrI9UM+9r24JncZ0yA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tW+NNTnh; 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="tW+NNTnh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5309DC4CEE3; Sun, 26 Jan 2025 14:57:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737903435; bh=Hp9DZrCKjPM+6PwiDNFCOHJ/yx2WVOqIMsJwOuCGVSQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tW+NNTnhK6BSyiI0U7norDFeyrCX2fr8I41WdGfbuzYG2A4BKH7OBLxT1STrhKrJ7 FWUZlSg4tBjvhCj/ZarK74MUxJQHGcG/CnlnutF7QwHGTFVKZxSfm09yL344uFVo2m 7d9EYt+sqUjeGYXFe2h+smDm4ofvkaixFY2NmKerll26bLZw9buCLNNpzgGpsAEJPv IBKTjX7mVLPj4VMqHyjMdWFpO5a0IZx4x+lqbG0EPvAEtN5sv9HSvdbJ6VI0lxZJj1 GZSk8zjzW6dB6pDUkrNuVaQSSYLzuz8iYT7k8ZGBN1ZozDoE38svWPGiYjwuE/nJ4e 7TheRAXI09xjg== 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 5.15 2/3] drm/sti: hdmi: use eld_mutex to protect access to connector->eld Date: Sun, 26 Jan 2025 09:57:10 -0500 Message-Id: <20250126145711.946014-2-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250126145711.946014-1-sashal@kernel.org> References: <20250126145711.946014-1-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 5.15.177 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 36bea1551ef84..8b2f44d73630b 100644 --- a/drivers/gpu/drm/sti/sti_hdmi.c +++ b/drivers/gpu/drm/sti/sti_hdmi.c @@ -1219,7 +1219,9 @@ 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