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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,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 437EDC282C8 for ; Mon, 28 Jan 2019 17:39:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D95932148E for ; Mon, 28 Jan 2019 17:39:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548697183; bh=w/V69oehWZgZVfladWi/weszw6y6QVrDQei9A5BVSHM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=UfXOIe5r7tfS3ovFwncLyHZywdKHPYX9AFp0bgre8vFHMsfTWAyv7es+1nFRYV9Fn 6yHH08XKVDUXRRV7RZHMiVDua4XLUmBo2LG3VzGmy1YmMuxRc8Zj65bWScjhsDGWDg t4MJr3VlLJ+is8Ix2Ub6TqRfCP5eaWiwKxlNbGWQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729421AbfA1PxN (ORCPT ); Mon, 28 Jan 2019 10:53:13 -0500 Received: from mail.kernel.org ([198.145.29.99]:39562 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728363AbfA1PxM (ORCPT ); Mon, 28 Jan 2019 10:53:12 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B252420880; Mon, 28 Jan 2019 15:53:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548690791; bh=w/V69oehWZgZVfladWi/weszw6y6QVrDQei9A5BVSHM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ywbF+DQ9bYe3ABB0iEvEoRH/l5QCPnsiVaESz5DuMlQ1jRXKXW7/I9FYpt+NbQhwL +VlObzmjyRZmMw8d4W2IvXx7ET0+RFO8OSeNEfssENX5a6BqCoQcJLme5TM/gN9+yp SSIybpy9/tqPdY+wqUBKOvRtbixMuOnFLvLr50aA= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Geert Uytterhoeven , Greg Kroah-Hartman , Sasha Levin , linux-serial@vger.kernel.org Subject: [PATCH AUTOSEL 4.20 194/304] serial: sh-sci: Resume PIO in sci_rx_interrupt() on DMA failure Date: Mon, 28 Jan 2019 10:41:51 -0500 Message-Id: <20190128154341.47195-194-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190128154341.47195-1-sashal@kernel.org> References: <20190128154341.47195-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Geert Uytterhoeven [ 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 613007d7165e..21fd3f6ad28e 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