From nobody Mon Sep 28 19:24:49 2026 Received: from mail-m155101.qiye.163.com (mail-m155101.qiye.163.com [101.71.155.101]) (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 72594392C4C; Tue, 18 Aug 2026 13:53:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=101.71.155.101 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787061220; cv=none; b=GIDZd9EzTg5JUNp+HR6TyYnG3Xx8NmhNCYMYAWmPvSZ6aMNxrZYn20/cFkMDjCcbfZ0CUccdpk9T1NhBgo3UHNKQE6UyipLuZQQrsPViat1AlIzQXTcn3dw+FbIyiQJ7NDwfBTiTJ7Yj+Clkvuh9Isd847EIN1CSAZaLHAl1d5U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787061220; c=relaxed/simple; bh=e1tuGGIP/ZBZCvqevNu0/K1XTDfvFeK+Xm8w4RcQAic=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=iHXr3FCVVn1VgMT3d9j4D0M6AxD4n6fXFbmp0ODCC1rANtbc1Xn6QzIfDiIwVDj+wE3++49s3+HzqRK81Iw65LK4iMc3h6Wa9M4ohenv8XRCJY2fdEMoloHsjoCFElSqlg2wye67cG9VenpVayTuMYASAw1/9Ijzw4Nq/ESXLGc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=seu.edu.cn; spf=pass smtp.mailfrom=seu.edu.cn; dkim=pass (1024-bit key) header.d=seu.edu.cn header.i=@seu.edu.cn header.b=G0qBUXxe; arc=none smtp.client-ip=101.71.155.101 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=seu.edu.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=seu.edu.cn Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=seu.edu.cn header.i=@seu.edu.cn header.b="G0qBUXxe" Received: from PC-202605011814.localdomain (unknown [222.191.246.242]) by smtp.qiye.163.com (Hmail) with ESMTP id 4a6d2cde8; Tue, 18 Aug 2026 21:53:24 +0800 (GMT+08:00) From: Runyu Xiao To: Helge Deller Cc: Rob Clark , Dave Airlie , Tomi Valkeinen , linux-omap@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Runyu Xiao , Jianhao Xu Subject: [PATCH] fbdev: omapfb: panel-dsi-cm: initialize lock before registering display Date: Tue, 18 Aug 2026 21:53:18 +0800 Message-Id: <20260818135318.1957283-1-runyu.xiao@seu.edu.cn> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-HM-Tid: 0aa01525f6e303a1kunm72eec736112e9a X-HM-MType: 10 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFITzdXWRgWCB1ZQUpXWS1ZQUlXWQ8JGhUIEh9ZQVkaQhlPVkIaSxgfSkpPQ0lMSlYeHw 5VEwETFhoSFyQUDg9ZV1kYEgtZQVlJSUlVSkJKVUlPTVVJT0lZV1kWGg8SFR0UWUFZT0tIVUpLSE pPSExVSktLVUpCS0tZBg++ DKIM-Signature: a=rsa-sha256; b=G0qBUXxeocdkLCIoutjgBg2bW2KZzL0MMhhr5go1jone8lqArYrEx392j8fvU7hKyeADD48P3x9yYzvSsZZxZmw+XGGj5N0i2tv9yKx74lWGwpObIE5iRlIxJymIB4BgTxSH6XNiQrB4AheC42H9pWUbPvEGU4wuWrwklBQDJXI=; c=relaxed/relaxed; s=default; d=seu.edu.cn; v=1; bh=s8wa7yiZYDJ20bpSxGQc5WMiume6jdmMCtn+WJuBMr4=; h=date:mime-version:subject:message-id:from; Content-Type: text/plain; charset="utf-8" dsicm_probe() registers the display before initializing ddata->lock. Once omapdss_register_display() publishes the display, another consumer can reach a dsicm callback that takes this mutex while it is still uninitialized. Initialize the mutex before registering the display so the published callbacks always see a valid lock. Fixes: f76ee892a99e ("omapfb: copy omapdss & displays for omapfb") Cc: stable@vger.kernel.org Signed-off-by: Runyu Xiao --- drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c b/dri= vers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c index 1d75f27c6b80..ce1d4d5f4034 100644 --- a/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c +++ b/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c @@ -1151,14 +1151,14 @@ static int dsicm_probe(struct platform_device *pdev) dssdev->caps =3D OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE | OMAP_DSS_DISPLAY_CAP_TEAR_ELIM; =20 + mutex_init(&ddata->lock); + r =3D omapdss_register_display(dssdev); if (r) { dev_err(dev, "Failed to register panel\n"); goto err_reg; } =20 - mutex_init(&ddata->lock); - atomic_set(&ddata->do_update, 0); =20 ddata->reset_gpio =3D devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW); --=20 2.34.1