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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A607C46467 for ; Mon, 16 Jan 2023 16:35:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233456AbjAPQfa (ORCPT ); Mon, 16 Jan 2023 11:35:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48364 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233331AbjAPQef (ORCPT ); Mon, 16 Jan 2023 11:34:35 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CE86329E24 for ; Mon, 16 Jan 2023 08:22:21 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 68B9F6104F for ; Mon, 16 Jan 2023 16:22:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C3FEC433F0; Mon, 16 Jan 2023 16:22:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673886140; bh=oirjHvUm/24DGQLv4pPofWFz6LgNO1j6+Bh8e6KtH1I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bZt/dzXapxVP/zuKqHNWjH7/MVDtCQyZXwuBEH0nOdlqNYrAGmU6P2Nkql4+dhkab wle9U4MeeHCbvfa1XW/LFUppqkfTRtrnwV8SgVBYFwIFYhC456t4yCwbbKQeec8ksv v1fYg17krDKosIkWiq4FJlO037u9IgTLBQ3ZN4Kk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tobias Klauser , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Jiri Slaby , Sasha Levin Subject: [PATCH 5.4 288/658] tty: serial: clean up stop-tx part in altera_uart_tx_chars() Date: Mon, 16 Jan 2023 16:46:16 +0100 Message-Id: <20230116154922.767465666@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154909.645460653@linuxfoundation.org> References: <20230116154909.645460653@linuxfoundation.org> User-Agent: quilt/0.67 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: Jiri Slaby [ Upstream commit d9c128117da41cf4cb0e80ae565b5d3ac79dffac ] The "stop TX" path in altera_uart_tx_chars() is open-coded, so: * use uart_circ_empty() to check if the buffer is empty, and * when true, call altera_uart_stop_tx(). Cc: Tobias Klauser Reviewed-by: Ilpo Järvinen Acked-by: Tobias Klauser Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20220920052049.20507-3-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman Stable-dep-of: 1307c5d33cce ("serial: altera_uart: fix locking in polling mode") Signed-off-by: Sasha Levin --- drivers/tty/serial/altera_uart.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c index 0e487ce091ac..508a3c2b7781 100644 --- a/drivers/tty/serial/altera_uart.c +++ b/drivers/tty/serial/altera_uart.c @@ -274,10 +274,8 @@ static void altera_uart_tx_chars(struct altera_uart *pp) if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port); - if (xmit->head == xmit->tail) { - pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; - altera_uart_update_ctrl_reg(pp); - } + if (uart_circ_empty(xmit)) + altera_uart_stop_tx(port); } static irqreturn_t altera_uart_interrupt(int irq, void *data) -- 2.35.1