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 B6DE9405D0 for ; Mon, 22 Jan 2024 18:48:25 +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=1705949305; cv=none; b=adWrk3Vz1BI1ALYnemQHZyibMRTkQ22+jD8DaIVAYvZzfN6r5ZD+wzlaqUiFFfSCHKm8nqQF0MkAhMi8TINGkKKNfOvWCpZ8KBtrmPZOPH7koKe4GyF0Vy59+9tC/S0K6TrGAqONNjlZ6mvb2D1iS4BV4B9UBU75Ev5ysH18wd0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705949305; c=relaxed/simple; bh=7eXbLTRZxLKxxf3whMambHra194Pfv8sLUJdFEtyzXs=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=XxSpq61IjuCOthl+d2LfRMjJvP3FHBoJf2hn1MRDGULff4bmVy815YbTydzJjKHuGKlt9dxM8wLXDT3dy1OPesN3ytpZWOffCzS4K8BHvba6xkr+2vWUB8R5/FFgnAyVQrRhH5WLBpfDvetXAB731mbznOhFwxQaL5EEWcqIGBU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Cc30grH8; 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="Cc30grH8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43084C433C7; Mon, 22 Jan 2024 18:48:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1705949305; bh=7eXbLTRZxLKxxf3whMambHra194Pfv8sLUJdFEtyzXs=; h=Subject:To:Cc:From:Date:From; b=Cc30grH8u4ojHN72zENH5VZ6A0gLNIxtXudsug65YlZASaBejQ1+VW+AQJf1dEoh7 KnR61FDZfdYtHQFvI+yGK/fQ5F/0cJMlXZyqBpiEt3Ia+m5UHDbuQHj3aC+/OhNV6D OFe54bbm63643jfihmAT4btfCCv/yM87qc8C58dU= Subject: FAILED: patch "[PATCH] serial: Do not hold the port lock when setting rx-during-tx" failed to apply to 6.6-stable tree To: l.sanfilippo@kunbus.com,gregkh@linuxfoundation.org,s.hauer@pengutronix.de,shawnguo@kernel.org,stable@vger.kernel.org Cc: From: Date: Mon, 22 Jan 2024 10:48:04 -0800 Message-ID: <2024012204-tattered-oxidation-ac0c@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 07c30ea5861fb26a77dade8cdc787252f6122fb1 # git commit -s git send-email --to '' --in-reply-to '2024012204-tattered-oxidation-ac0c@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: 07c30ea5861f ("serial: Do not hold the port lock when setting rx-during-tx GPIO") fe2017ba24f3 ("Merge 6.6-rc6 into tty-next") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 07c30ea5861fb26a77dade8cdc787252f6122fb1 Mon Sep 17 00:00:00 2001 From: Lino Sanfilippo Date: Wed, 3 Jan 2024 07:18:12 +0100 Subject: [PATCH] serial: Do not hold the port lock when setting rx-during-tx GPIO Both the imx and stm32 driver set the rx-during-tx GPIO in rs485_config(). Since this function is called with the port lock held, this can be a problem in case that setting the GPIO line can sleep (e.g. if a GPIO expander is used which is connected via SPI or I2C). Avoid this issue by moving the GPIO setting outside of the port lock into the serial core and thus making it a generic feature. Also with commit c54d48543689 ("serial: stm32: Add support for rs485 RX_DURING_TX output GPIO") the SER_RS485_RX_DURING_TX flag is only set if a rx-during-tx GPIO is _not_ available, which is wrong. Fix this, too. Furthermore reset old GPIO settings in case that changing the RS485 configuration failed. Fixes: c54d48543689 ("serial: stm32: Add support for rs485 RX_DURING_TX output GPIO") Fixes: ca530cfa968c ("serial: imx: Add support for RS485 RX_DURING_TX output GPIO") Cc: Shawn Guo Cc: Sascha Hauer Cc: Signed-off-by: Lino Sanfilippo Link: https://lore.kernel.org/r/20240103061818.564-2-l.sanfilippo@kunbus.com Signed-off-by: Greg Kroah-Hartman diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index a0fcf18cbeac..8b7d9c5a7455 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1948,10 +1948,6 @@ static int imx_uart_rs485_config(struct uart_port *port, struct ktermios *termio rs485conf->flags & SER_RS485_RX_DURING_TX) imx_uart_start_rx(port); - if (port->rs485_rx_during_tx_gpio) - gpiod_set_value_cansleep(port->rs485_rx_during_tx_gpio, - !!(rs485conf->flags & SER_RS485_RX_DURING_TX)); - return 0; } diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index cc866da50b81..8d381c283cec 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1407,6 +1407,16 @@ static void uart_set_rs485_termination(struct uart_port *port, !!(rs485->flags & SER_RS485_TERMINATE_BUS)); } +static void uart_set_rs485_rx_during_tx(struct uart_port *port, + const struct serial_rs485 *rs485) +{ + if (!(rs485->flags & SER_RS485_ENABLED)) + return; + + gpiod_set_value_cansleep(port->rs485_rx_during_tx_gpio, + !!(rs485->flags & SER_RS485_RX_DURING_TX)); +} + static int uart_rs485_config(struct uart_port *port) { struct serial_rs485 *rs485 = &port->rs485; @@ -1418,12 +1428,17 @@ static int uart_rs485_config(struct uart_port *port) uart_sanitize_serial_rs485(port, rs485); uart_set_rs485_termination(port, rs485); + uart_set_rs485_rx_during_tx(port, rs485); uart_port_lock_irqsave(port, &flags); ret = port->rs485_config(port, NULL, rs485); uart_port_unlock_irqrestore(port, flags); - if (ret) + if (ret) { memset(rs485, 0, sizeof(*rs485)); + /* unset GPIOs */ + gpiod_set_value_cansleep(port->rs485_term_gpio, 0); + gpiod_set_value_cansleep(port->rs485_rx_during_tx_gpio, 0); + } return ret; } @@ -1462,6 +1477,7 @@ static int uart_set_rs485_config(struct tty_struct *tty, struct uart_port *port, return ret; uart_sanitize_serial_rs485(port, &rs485); uart_set_rs485_termination(port, &rs485); + uart_set_rs485_rx_during_tx(port, &rs485); uart_port_lock_irqsave(port, &flags); ret = port->rs485_config(port, &tty->termios, &rs485); @@ -1473,8 +1489,14 @@ static int uart_set_rs485_config(struct tty_struct *tty, struct uart_port *port, port->ops->set_mctrl(port, port->mctrl); } uart_port_unlock_irqrestore(port, flags); - if (ret) + if (ret) { + /* restore old GPIO settings */ + gpiod_set_value_cansleep(port->rs485_term_gpio, + !!(port->rs485.flags & SER_RS485_TERMINATE_BUS)); + gpiod_set_value_cansleep(port->rs485_rx_during_tx_gpio, + !!(port->rs485.flags & SER_RS485_RX_DURING_TX)); return ret; + } if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) return -EFAULT; diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 9781c143def2..794b77512740 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -226,12 +226,6 @@ static int stm32_usart_config_rs485(struct uart_port *port, struct ktermios *ter stm32_usart_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit)); - if (port->rs485_rx_during_tx_gpio) - gpiod_set_value_cansleep(port->rs485_rx_during_tx_gpio, - !!(rs485conf->flags & SER_RS485_RX_DURING_TX)); - else - rs485conf->flags |= SER_RS485_RX_DURING_TX; - if (rs485conf->flags & SER_RS485_ENABLED) { cr1 = readl_relaxed(port->membase + ofs->cr1); cr3 = readl_relaxed(port->membase + ofs->cr3); @@ -256,6 +250,8 @@ static int stm32_usart_config_rs485(struct uart_port *port, struct ktermios *ter writel_relaxed(cr3, port->membase + ofs->cr3); writel_relaxed(cr1, port->membase + ofs->cr1); + + rs485conf->flags |= SER_RS485_RX_DURING_TX; } else { stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DEM | USART_CR3_DEP);