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=-13.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 BB6ADC4741F for ; Tue, 29 Sep 2020 12:34:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6771E20759 for ; Tue, 29 Sep 2020 12:34:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601382858; bh=u0gIlx+26lPy9i8hc8Z2XqPWMlpcGLOnbaDcSsjvkrE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QwTWfnjaTa0+cn29h/kaBiIEDvJKcCjv8v16wImM891QUNSD2nVv7FZclmp3Ww3m+ FhGUmJco9G1Sx3deIpiCS6JrJznocNkE0jhjLL7IM+rNKW8p0C34AxohRKYCZaOp8K 51wXZoqMf+M7A7JbCj7KWS4mbffhqw/XayYIuYK0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729191AbgI2LW4 (ORCPT ); Tue, 29 Sep 2020 07:22:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:34428 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729634AbgI2LRf (ORCPT ); Tue, 29 Sep 2020 07:17:35 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 0B8F9206DB; Tue, 29 Sep 2020 11:17:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601378254; bh=u0gIlx+26lPy9i8hc8Z2XqPWMlpcGLOnbaDcSsjvkrE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=w2clj4SizrnxKoqqKE2Ck0PY7IysA3ll2ejXvEE83RrwH5u/HhP6j+5EPGhv0rvyB 4vSgbBn0dzTugWE3woXbXSbXrAjZJGjoykuSjfFVf7U1RRp1BpvZwdDEv+KiIvHuJp kyGdabqOhyvCuFjPvE2JUboT/V6Wkk4ZTVpEZA70= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vignesh Raghavendra , Sasha Levin Subject: [PATCH 4.14 088/166] serial: 8250: 8250_omap: Terminate DMA before pushing data on RX timeout Date: Tue, 29 Sep 2020 13:00:00 +0200 Message-Id: <20200929105939.608685288@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200929105935.184737111@linuxfoundation.org> References: <20200929105935.184737111@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: linux-kernel@vger.kernel.org From: Vignesh Raghavendra [ Upstream commit 7cf4df30a98175033e9849f7f16c46e96ba47f41 ] Terminate and flush DMA internal buffers, before pushing RX data to higher layer. Otherwise, this will lead to data corruption, as driver would end up pushing stale buffer data to higher layer while actual data is still stuck inside DMA hardware and has yet not arrived at the memory. While at that, replace deprecated dmaengine_terminate_all() with dmaengine_terminate_async(). Signed-off-by: Vignesh Raghavendra Link: https://lore.kernel.org/r/20200319110344.21348-2-vigneshr@ti.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/8250/8250_omap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index 33df33a9e646a..726852ebef855 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -773,7 +773,10 @@ static void __dma_rx_do_complete(struct uart_8250_port *p) dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); count = dma->rx_size - state.residue; - + if (count < dma->rx_size) + dmaengine_terminate_async(dma->rxchan); + if (!count) + goto unlock; ret = tty_insert_flip_string(tty_port, dma->rx_buf, count); p->port.icount.rx += ret; @@ -833,7 +836,6 @@ static void omap_8250_rx_dma_flush(struct uart_8250_port *p) spin_unlock_irqrestore(&priv->rx_dma_lock, flags); __dma_rx_do_complete(p); - dmaengine_terminate_all(dma->rxchan); } static int omap_8250_rx_dma(struct uart_8250_port *p) -- 2.25.1