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 B3940215F6C; Tue, 29 Apr 2025 17:56:39 +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=1745949399; cv=none; b=Vrpc2QRwLQ7KMKurB6RcGk+jB74zZg4UBpSVKeE1wMXtWUvAFfo47rzjxF/Mt96zfc2z5/UDzXkT4bgpGMbLEzeDKYfBSHgfmFhlW2poRtrMWajZ/keJrN/9KXCLzqLy8ob0hua1g6Hm/BEuAiMzLdWQ8ZaG2nx7Pz0Uu0ca45s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745949399; c=relaxed/simple; bh=m9Umx7Rmkh+X0HXArvwTOHy1PURza1GjRCPs9Bp9Isw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Q7DHNI1KHCZsNETjvpKQCXty8eOU5RRZZcEz5QRQoNTIPwy+UdqSfRxnxPcypVLaqpHbkftvF+czO2cC+LDVW7z2A5mjWWXJCMBochPyCXPujuEHpdVq7L3kWroSg2ubLlt7W8ShXGF+sn38H00YF5rzCOcoTEPLbJtzeLx3/+s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=J3Frioay; 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="J3Frioay" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 398E0C4CEE3; Tue, 29 Apr 2025 17:56:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745949399; bh=m9Umx7Rmkh+X0HXArvwTOHy1PURza1GjRCPs9Bp9Isw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J3FrioayMqtHMsSayNc56UFLU3fHbtJ6GujxJ7No2qiMhOHd8kqZ3u8Xb+G83ayHJ SdP+UovGLyGBuDKwU96uqDy6l4QtcKpJY1UWlxgx1NwnwhaH2cmWYxn0n/zRTH9L+f Xs/Kk15/d/9lp4ZOpFeVQ62FJwWp8uiwWDlpzSPg= 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 5.15 306/373] serial: sifive: lock port in startup()/shutdown() callbacks Date: Tue, 29 Apr 2025 18:43:03 +0200 Message-ID: <20250429161135.703640414@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250429161123.119104857@linuxfoundation.org> References: <20250429161123.119104857@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 5.15-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 @@ -595,8 +595,11 @@ 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; } @@ -604,9 +607,12 @@ 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); } /**