From patchwork Wed Dec 29 13:53:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Tu X-Patchwork-Id: 528944 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A115C433F5 for ; Wed, 29 Dec 2021 13:55:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238580AbhL2Nzh (ORCPT ); Wed, 29 Dec 2021 08:55:37 -0500 Received: from mail-sh.amlogic.com ([58.32.228.43]:39396 "EHLO mail-sh.amlogic.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229554AbhL2Nzf (ORCPT ); Wed, 29 Dec 2021 08:55:35 -0500 Received: from droid06.amlogic.com (10.18.11.248) by mail-sh.amlogic.com (10.18.11.5) with Microsoft SMTP Server id 15.1.2176.14; Wed, 29 Dec 2021 21:55:30 +0800 From: Yu Tu To: , , , CC: Greg Kroah-Hartman , Jiri Slaby , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Yu Tu Subject: [PATCH V2 6/6] tty: serial: meson: Change request_irq to devm_request_irq and move devm_request_irq to meson_uart_probe() Date: Wed, 29 Dec 2021 21:53:50 +0800 Message-ID: <20211229135350.9659-7-yu.tu@amlogic.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211229135350.9659-1-yu.tu@amlogic.com> References: <20211229135350.9659-1-yu.tu@amlogic.com> MIME-Version: 1.0 X-Originating-IP: [10.18.11.248] Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org Because an interrupt error occurs when the user opens /dev/ttyAML* but don't close it, and then opens the same port again. This problem is encountered in actual projects. Signed-off-by: Yu Tu --- drivers/tty/serial/meson_uart.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c index c17109d6d441..41c2c607e70e 100644 --- a/drivers/tty/serial/meson_uart.c +++ b/drivers/tty/serial/meson_uart.c @@ -135,8 +135,6 @@ static void meson_uart_shutdown(struct uart_port *port) unsigned long flags; u32 val; - free_irq(port->irq, port); - spin_lock_irqsave(&port->lock, flags); val = readl(port->membase + AML_UART_CONTROL); @@ -284,7 +282,6 @@ static void meson_uart_reset(struct uart_port *port) static int meson_uart_startup(struct uart_port *port) { u32 val; - int ret; meson_uart_reset(port); @@ -298,10 +295,7 @@ static int meson_uart_startup(struct uart_port *port) val = (AML_UART_RECV_IRQ(1) | AML_UART_XMIT_IRQ(port->fifosize / 2)); writel(val, port->membase + AML_UART_MISC); - ret = request_irq(port->irq, meson_uart_interrupt, 0, - port->name, port); - - return ret; + return 0; } static void meson_uart_change_speed(struct uart_port *port, unsigned long baud) @@ -908,6 +902,14 @@ static int meson_uart_probe(struct platform_device *pdev) meson_ports[pdev->id] = port; platform_set_drvdata(pdev, port); + ret = devm_request_irq(&pdev->dev, port->irq, meson_uart_interrupt, + 0, dev_name(&pdev->dev), port); + if (ret) { + dev_err(&pdev->dev, "failed to request uart irq: %d\n", + ret); + return ret; + } + /* reset port before registering (and possibly registering console) */ meson_uart_reset(port);