From patchwork Wed Nov 6 12:01:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudiu Beznea X-Patchwork-Id: 13864567 Received: from mail-lj1-f172.google.com (mail-lj1-f172.google.com [209.85.208.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 208561DFD95 for ; Wed, 6 Nov 2024 12:01:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730894499; cv=none; b=CMFxcLvk4XUzi3Kk0ycsCP9rmfLcWsxeA0s0cMgFOljGrXx37vXvxu5WZBCInKpgeKgWnnhxGFvx7aktBdgrF+nFzxRdvqhSxg9be/kLmv6WcXi7aF3QmE0/UVvEU53xCf6SXi7fKHHg8fg4+tAGVRCIDyOCLj3vsKEiZGcwdG0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730894499; c=relaxed/simple; bh=15y5NJJUa1+Ljo2j6VmXklAxf4e4qGswvP0p5ryi2jQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=dO1QYUstrXbMUQSjuCUdAf2XKg6OZJci/ME944XWcSEkBdthtPqTY/cu5xzOd31u5ekb3f3vQpvxnhUXS9BYQXd0u2IsMNQfAFvIgOwBWAIdrqioUgsD535iTmV/nni8XZy3FjKVbx0FEnY4uKALqIu7sBzS0mU2++dj9dmj510= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=tuxon.dev; spf=pass smtp.mailfrom=tuxon.dev; dkim=pass (2048-bit key) header.d=tuxon.dev header.i=@tuxon.dev header.b=cJIW0mLq; arc=none smtp.client-ip=209.85.208.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=tuxon.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=tuxon.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=tuxon.dev header.i=@tuxon.dev header.b="cJIW0mLq" Received: by mail-lj1-f172.google.com with SMTP id 38308e7fff4ca-2f75c56f16aso60677691fa.0 for ; Wed, 06 Nov 2024 04:01:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tuxon.dev; s=google; t=1730894495; x=1731499295; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=s+mBCBo66bw/9iI5Hy/6whocckJK37iPQ5dEvf3mSi0=; b=cJIW0mLqg4VGo4VfL6i3wInJku4RcrOt1JZa/Kkb6XA0ZMPCwDAkZuqbaMGmtGStq7 jTOFCRdVBttT0knJQ75XBJ/1GjJb4lf5zRDfUpfWlFFhcVOTRXTgHZgab6LlHB6OpWG9 bqBqAHBy+Hqo3ZT15NbsS+lgA/rPSOGVX9YkdQNHRoLmxs/wqkM2yPFwxAWT0njIQXj+ MUb12lNSO5UAmp9TknUQjYTmwEmhEsG6+d3VV45NelGV0lrYdU0RTCDuTSxFPct1LD3i mxYPPxnFoAxJGrVpp7WmrhXWnioaGwk9efnB+zPFnk5q4l7F6Cq92PJSa3JowOtGZMW9 Gxsw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730894495; x=1731499295; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=s+mBCBo66bw/9iI5Hy/6whocckJK37iPQ5dEvf3mSi0=; b=qopx3ju3NRC0Ed25illkgUGdvmyF9bq3WIrGJ4r/rQVvprP1D1xTyXjLgwnK9ueff7 0jm/eq3GxvyJC3+zeJJvqkcowVpCtmfrrckIDcg0JX1WP2MFBpA2RoU8X0fw4DP/OfvE Do4CrT6tbs9mLe7sRIr+WsrPdNLynrZFxxhmLvL/PdhZsd7EmXvvg16X1qIQ+dQCVKm4 Ek7oQLMrdCHToHLCwcrplsbgtaWgIINk6tXkovqivizvfkFnAuu4rLdReJiWs6+WYRqR 2wPag2Bk4oh7PpgzPxUD/9v6mLJMh6lCkjLJgVlE3Xl8CRvWTzna66XhBp+e5JoynTHJ yY5w== X-Forwarded-Encrypted: i=1; AJvYcCXUuqf6Nt7sts7MbaM16RmydiJSVTQfhWRp3LV49xE/eGSLhyZxRwOjqwA2lve81xqll1duGfbpDdY=@vger.kernel.org X-Gm-Message-State: AOJu0Yx2VgZQcGt9ZOLj4VA3tu5K1oPG28yLqXADVnNWNp9kbrRwYGGF yFawVUifwkGEOZxcybwTTAz1nvA2E16nU7Vhcwg41joEJ/93r3xJrKVhGnPWaDo= X-Google-Smtp-Source: AGHT+IEgZNw14uc4vk+ZnHTPI7ALllPV0JWZSlCJwgecPv++T4OGVwPAYuvtTxG35blsJlYuNeZV3A== X-Received: by 2002:a05:651c:154b:b0:2fb:6394:d6bd with SMTP id 38308e7fff4ca-2fdec4e750emr94353991fa.12.1730894495197; Wed, 06 Nov 2024 04:01:35 -0800 (PST) Received: from claudiu-X670E-Pro-RS.. ([82.78.167.28]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5cee6afe528sm2697984a12.55.2024.11.06.04.01.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 Nov 2024 04:01:34 -0800 (PST) From: Claudiu X-Google-Original-From: Claudiu To: geert+renesas@glider.be, magnus.damm@gmail.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, mturquette@baylibre.com, sboyd@kernel.org, gregkh@linuxfoundation.org, jirislaby@kernel.org, p.zabel@pengutronix.de, lethal@linux-sh.org, g.liakhovetski@gmx.de, ysato@users.sourceforge.jp, ulrich.hecht+renesas@gmail.com Cc: claudiu.beznea@tuxon.dev, linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, linux-serial@vger.kernel.org, Claudiu Beznea , stable@vger.kernel.org Subject: [PATCH 3/9] serial: sh-sci: Clean sci_ports[0] after at earlycon exit Date: Wed, 6 Nov 2024 14:01:12 +0200 Message-Id: <20241106120118.1719888-4-claudiu.beznea.uj@bp.renesas.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20241106120118.1719888-1-claudiu.beznea.uj@bp.renesas.com> References: <20241106120118.1719888-1-claudiu.beznea.uj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Claudiu Beznea The early_console_setup() function initializes the sci_ports[0].port with an object of type struct uart_port obtained from the object of type struct earlycon_device received as argument by the early_console_setup(). It may happen that later, when the rest of the serial ports are probed, the serial port that was used as earlycon (e.g., port A) to be mapped to a different position in sci_ports[] and the slot 0 to be used by a different serial port (e.g., port B), as follows: sci_ports[0] = port A sci_ports[X] = port B In this case, the new port mapped at index zero will have associated data that was used for earlycon. In case this happens, after Linux boot, any access to the serial port that maps on sci_ports[0] (port A) will block the serial port that was used as earlycon (port B). To fix this, add early_console_exit() that clean the sci_ports[0] at earlycon exit time. Fixes: 0b0cced19ab1 ("serial: sh-sci: Add CONFIG_SERIAL_EARLYCON support") Cc: stable@vger.kernel.org Signed-off-by: Claudiu Beznea --- drivers/tty/serial/sh-sci.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 8e2d534401fa..2f8188bdb251 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -3546,6 +3546,32 @@ sh_early_platform_init_buffer("earlyprintk", &sci_driver, #ifdef CONFIG_SERIAL_SH_SCI_EARLYCON static struct plat_sci_port port_cfg __initdata; +static int early_console_exit(struct console *co) +{ + struct sci_port *sci_port = &sci_ports[0]; + struct uart_port *port = &sci_port->port; + unsigned long flags; + int locked = 1; + + if (port->sysrq) + locked = 0; + else if (oops_in_progress) + locked = uart_port_trylock_irqsave(port, &flags); + else + uart_port_lock_irqsave(port, &flags); + + /* + * Clean the slot used by earlycon. A new SCI device might + * map to this slot. + */ + memset(sci_ports, 0, sizeof(*sci_port)); + + if (locked) + uart_port_unlock_irqrestore(port, flags); + + return 0; +} + static int __init early_console_setup(struct earlycon_device *device, int type) { @@ -3562,6 +3588,8 @@ static int __init early_console_setup(struct earlycon_device *device, SCSCR_RE | SCSCR_TE | port_cfg.scscr); device->con->write = serial_console_write; + device->con->exit = early_console_exit; + return 0; } static int __init sci_early_console_setup(struct earlycon_device *device,