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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 95D8AC282CE for ; Mon, 11 Feb 2019 15:42:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 656E6222A7 for ; Mon, 11 Feb 2019 15:42:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549899721; bh=kH4FaGw0nRJdSn2wcUmLK3AnZLJRAY6Bs+S/3dxbj1A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Yk3thv+BQIM62OGEFlR0A72LO45Jm/FdTiZoZqYqesh41m/GFm4KrZgyZ4g6lDL1s STDQhtayetAmz73I2WJnCp3j394Mdyx067mKB+tFYd+R5/F3byhwLmsGGpF2z8oEzp 3UqRk3mqDRnX+9sTJVy7eNezHaSPPVCrTKmhrpvQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387476AbfBKPl7 (ORCPT ); Mon, 11 Feb 2019 10:41:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:60496 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732738AbfBKOrO (ORCPT ); Mon, 11 Feb 2019 09:47:14 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CB78B20700; Mon, 11 Feb 2019 14:47:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549896433; bh=kH4FaGw0nRJdSn2wcUmLK3AnZLJRAY6Bs+S/3dxbj1A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ACCTKYd1zdRzhTHg/B/VHw7j+A09JR6iN0G9KX85RFbXF1g7GWUUd3EQFoMcc6aMA MQG0pWZbp9Nyk+hlfO29rAkhWPySp6ytCwUzYaG+hlPvAAoVAWb9aq3lB4zsz4Z+pD 7Od2/InS66pqrXVw6A/h/mQQriwk8oQZJiQhRKZQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Geert Uytterhoeven , Simon Horman , Wolfram Sang , Sasha Levin Subject: [PATCH 4.19 155/313] serial: sh-sci: Resume PIO in sci_rx_interrupt() on DMA failure Date: Mon, 11 Feb 2019 15:17:15 +0100 Message-Id: <20190211141903.871575519@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141852.749630980@linuxfoundation.org> References: <20190211141852.749630980@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 71ab1c0336c71ace5725740f200beca9667a339f ] On (H)SCIF, sci_submit_rx() is called in the receive interrupt handler. Hence if DMA submission fails, the interrupt handler should resume handling reception using PIO, else no more data is received. Make sci_submit_rx() return an error indicator, so the receive interrupt handler can act appropriately. Signed-off-by: Geert Uytterhoeven Reviewed-by: Simon Horman Acked-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/sh-sci.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 5fdd7944b73b..c6e8ca2e5f7d 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1331,7 +1331,7 @@ static void sci_tx_dma_release(struct sci_port *s) dma_release_channel(chan); } -static void sci_submit_rx(struct sci_port *s, bool port_lock_held) +static int sci_submit_rx(struct sci_port *s, bool port_lock_held) { struct dma_chan *chan = s->chan_rx; struct uart_port *port = &s->port; @@ -1359,7 +1359,7 @@ static void sci_submit_rx(struct sci_port *s, bool port_lock_held) s->active_rx = s->cookie_rx[0]; dma_async_issue_pending(chan); - return; + return 0; fail: /* Switch to PIO */ @@ -1374,6 +1374,7 @@ fail: sci_start_rx(port); if (!port_lock_held) spin_unlock_irqrestore(&port->lock, flags); + return -EAGAIN; } static void work_fn_tx(struct work_struct *work) @@ -1668,8 +1669,10 @@ static irqreturn_t sci_rx_interrupt(int irq, void *ptr) disable_irq_nosync(irq); scr |= SCSCR_RDRQE; } else { + if (sci_submit_rx(s, false) < 0) + goto handle_pio; + scr &= ~SCSCR_RIE; - sci_submit_rx(s, false); } serial_port_out(port, SCSCR, scr); /* Clear current interrupt */ @@ -1681,6 +1684,8 @@ static irqreturn_t sci_rx_interrupt(int irq, void *ptr) return IRQ_HANDLED; } + +handle_pio: #endif if (s->rx_trigger > 1 && s->rx_fifo_timeout > 0) { -- 2.19.1