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 13E2A2517A8; Tue, 29 Apr 2025 18:15:36 +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=1745950536; cv=none; b=VH7O+JYm0X58FiEllWyU++kvkPSx7FCaRWO9PX77gVuksXiTu4mxArYrBC5GSrPPMna+e70lvTvIi8c3gSlUxQafDqLQeET1vvdU6skWDpBxG/f2ksWMgMnFY7xvltjo5CZPQ3jd8GTFtbaaXjxlQEiQtZzl/ShqYPIGvpbCYq8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745950536; c=relaxed/simple; bh=ZaOoIMxRRO83GQt8sxZrzAVcI8VkBs8GfEBbQHfqmYE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=K+wMnXz5wrjSdcDdX63vkACV8pPcDaSMQ6UlFLNw1bCmO/oQjyn6SHPnZAvCyO107ensO5fR08ajd+ujWGVmtBdCy1gpg7KyYR3OjxuN07wDgoqXh5BOLAqAACqWajjyX/oG6CEN+uZVK47t+SeuNwh6jKQ2mR3QE7OSJep/HRk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=aouyxgpU; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="aouyxgpU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 608C5C4CEE3; Tue, 29 Apr 2025 18:15:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745950535; bh=ZaOoIMxRRO83GQt8sxZrzAVcI8VkBs8GfEBbQHfqmYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aouyxgpUs6jTOxn3GPiAscUmJK7tZ3KIbV6BEVP3AuXGq44/ENACl3v9fDxCOmHw0 eoxgq9mY7c45fw4wrn2Qt757REmuxSpcvCXwRXEXO8yhJHXd0bqTBlGHOqRSDSFv90 68Cogkwkfpb7rJhRNV6aDe5VZS3SEJHyP8Tgo3Jk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ryo Takakura , Petr Mladek , John Ogness Subject: [PATCH 6.6 098/204] serial: sifive: lock port in startup()/shutdown() callbacks Date: Tue, 29 Apr 2025 18:43:06 +0200 Message-ID: <20250429161103.445547504@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250429161059.396852607@linuxfoundation.org> References: <20250429161059.396852607@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ryo Takakura commit e1ca3ff28ab1e2c1e70713ef3fa7943c725742c3 upstream. startup()/shutdown() callbacks access SIFIVE_SERIAL_IE_OFFS. The register is also accessed from write() callback. If console were printing and startup()/shutdown() callback gets called, its access to the register could be overwritten. Add port->lock to startup()/shutdown() callbacks to make sure their access to SIFIVE_SERIAL_IE_OFFS is synchronized against write() callback. Fixes: 45c054d0815b ("tty: serial: add driver for the SiFive UART") Signed-off-by: Ryo Takakura Reviewed-by: Petr Mladek Cc: stable@vger.kernel.org Reviewed-by: John Ogness Rule: add Link: https://lore.kernel.org/stable/20250330003522.386632-1-ryotkkr98%40gmail.com Link: https://lore.kernel.org/r/20250412001847.183221-1-ryotkkr98@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sifive.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/tty/serial/sifive.c +++ b/drivers/tty/serial/sifive.c @@ -562,8 +562,11 @@ static void sifive_serial_break_ctl(stru static int sifive_serial_startup(struct uart_port *port) { struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); + unsigned long flags; + uart_port_lock_irqsave(&ssp->port, &flags); __ssp_enable_rxwm(ssp); + uart_port_unlock_irqrestore(&ssp->port, flags); return 0; } @@ -571,9 +574,12 @@ static int sifive_serial_startup(struct static void sifive_serial_shutdown(struct uart_port *port) { struct sifive_serial_port *ssp = port_to_sifive_serial_port(port); + unsigned long flags; + uart_port_lock_irqsave(&ssp->port, &flags); __ssp_disable_rxwm(ssp); __ssp_disable_txwm(ssp); + uart_port_unlock_irqrestore(&ssp->port, flags); } /**