From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8112FC2D0E4 for ; Thu, 19 Nov 2020 09:01:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 14D7C24655 for ; Thu, 19 Nov 2020 09:01:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726334AbgKSJBJ (ORCPT ); Thu, 19 Nov 2020 04:01:09 -0500 Received: from szxga06-in.huawei.com ([45.249.212.32]:7952 "EHLO szxga06-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725936AbgKSJBI (ORCPT ); Thu, 19 Nov 2020 04:01:08 -0500 Received: from DGGEMS408-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4CcDDQ26RbzhcQj; Thu, 19 Nov 2020 17:00:54 +0800 (CST) Received: from localhost.localdomain (10.69.192.56) by DGGEMS408-HUB.china.huawei.com (10.3.19.208) with Microsoft SMTP Server id 14.3.487.0; Thu, 19 Nov 2020 17:01:03 +0800 From: Tian Tao To: , , , , , , Subject: [PATCH] tty: serial: replace spin_lock_irqsave by spin_lock in hard IRQ Date: Thu, 19 Nov 2020 17:01:29 +0800 Message-ID: <1605776489-16283-1-git-send-email-tiantao6@hisilicon.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.69.192.56] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The code has been in a irq-disabled context since it is hard IRQ. There is no necessity to do it again. Signed-off-by: Tian Tao --- drivers/tty/serial/owl-uart.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/owl-uart.c b/drivers/tty/serial/owl-uart.c index c149f8c3..472fdaf 100644 --- a/drivers/tty/serial/owl-uart.c +++ b/drivers/tty/serial/owl-uart.c @@ -251,10 +251,9 @@ static void owl_uart_receive_chars(struct uart_port *port) static irqreturn_t owl_uart_irq(int irq, void *dev_id) { struct uart_port *port = dev_id; - unsigned long flags; u32 stat; - spin_lock_irqsave(&port->lock, flags); + spin_lock(&port->lock); stat = owl_uart_read(port, OWL_UART_STAT); @@ -268,7 +267,7 @@ static irqreturn_t owl_uart_irq(int irq, void *dev_id) stat |= OWL_UART_STAT_RIP | OWL_UART_STAT_TIP; owl_uart_write(port, stat, OWL_UART_STAT); - spin_unlock_irqrestore(&port->lock, flags); + spin_unlock(&port->lock); return IRQ_HANDLED; } -- 2.7.4