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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7D4B9C433F5 for ; Mon, 4 Oct 2021 13:07:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5D3DC61401 for ; Mon, 4 Oct 2021 13:07:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235312AbhJDNJK (ORCPT ); Mon, 4 Oct 2021 09:09:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:39810 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235193AbhJDNHv (ORCPT ); Mon, 4 Oct 2021 09:07:51 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E6F5B61A35; Mon, 4 Oct 2021 13:01:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1633352515; bh=0dN88o96YP0pNo+/81dDK60JmrHL0hbAZ9I6xHd91zI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lkivtzh8JuaCyQpKgcz7zTjYzHq8ICuXaa7Glw6zomSRUUimHhzX/eI1Q/5sDRsBT aSlK++bNqJcD1V4mi15xF5Uwr6Ny6H/J8AHhjdDhmJNswHmg39vae0D+BeMrwOEjX4 +Ldznj7HaZGCEEkERB9Ko/vHqR1FK0I8Uy0Qz2Ao= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Pali=20Roh=C3=A1r?= Subject: [PATCH 4.19 17/95] serial: mvebu-uart: fix drivers tx_empty callback Date: Mon, 4 Oct 2021 14:51:47 +0200 Message-Id: <20211004125034.119664731@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211004125033.572932188@linuxfoundation.org> References: <20211004125033.572932188@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Pali Rohár commit 74e1eb3b4a1ef2e564b4bdeb6e92afe844e900de upstream. Driver's tx_empty callback should signal when the transmit shift register is empty. So when the last character has been sent. STAT_TX_FIFO_EMP bit signals only that HW transmit FIFO is empty, which happens when the last byte is loaded into transmit shift register. STAT_TX_EMP bit signals when the both HW transmit FIFO and transmit shift register are empty. So replace STAT_TX_FIFO_EMP check by STAT_TX_EMP in mvebu_uart_tx_empty() callback function. Fixes: 30530791a7a0 ("serial: mvebu-uart: initial support for Armada-3700 serial port") Cc: stable Signed-off-by: Pali Rohár Link: https://lore.kernel.org/r/20210911132017.25505-1-pali@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/mvebu-uart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -163,7 +163,7 @@ static unsigned int mvebu_uart_tx_empty( st = readl(port->membase + UART_STAT); spin_unlock_irqrestore(&port->lock, flags); - return (st & STAT_TX_FIFO_EMP) ? TIOCSER_TEMT : 0; + return (st & STAT_TX_EMP) ? TIOCSER_TEMT : 0; } static unsigned int mvebu_uart_get_mctrl(struct uart_port *port)