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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,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 51282C76188 for ; Fri, 19 Jul 2019 04:24:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2B54E2173B for ; Fri, 19 Jul 2019 04:24:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563510262; bh=8pM3LpYVx8Rwf+jt79f50jH08ME8Hq8RHx9jHHJL83U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lc+HjuRxSiiEYWvV3FtumI2zRmuZafZtsz4nvPnmkxoXVgc8yU5n7Ja+DcIECIDhb 7225O5OUdZN5G5IMjFFf5VwkJ9E2lBxMnFvXzjvzonRzWsWPG0C1qQ6G1/9qNgU9hx q5Wj4+uMtziIHMz+sBl5eoG+fi6W+nclbXKJJnfY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387721AbfGSEJl (ORCPT ); Fri, 19 Jul 2019 00:09:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:44122 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387588AbfGSEJc (ORCPT ); Fri, 19 Jul 2019 00:09:32 -0400 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 E96962189D; Fri, 19 Jul 2019 04:09:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563509371; bh=8pM3LpYVx8Rwf+jt79f50jH08ME8Hq8RHx9jHHJL83U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rto/5Xeqi7AZf0964MH5p3Z4ya6xywxPuiBgFNu43z6iEimlmqfj0QAs0MOHxLsO8 1JzKT/NP2BsIb0yAVkB1Kup989rIw0corioa9hDxyTTBz9y3SYY/DOS1oA/2uV08Uk yg+/XJJ8OaHrJx2lHG8cVCGID+BoPDdr/V+BpJ5s= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Geert Uytterhoeven , Eugeniu Rosca , Greg Kroah-Hartman , Sasha Levin , linux-serial@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 059/101] serial: sh-sci: Terminate TX DMA during buffer flushing Date: Fri, 19 Jul 2019 00:06:50 -0400 Message-Id: <20190719040732.17285-59-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190719040732.17285-1-sashal@kernel.org> References: <20190719040732.17285-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Geert Uytterhoeven [ Upstream commit 775b7ffd7d6d5db320d99b0a485c51e04dfcf9f1 ] While the .flush_buffer() callback clears sci_port.tx_dma_len since commit 1cf4a7efdc71cab8 ("serial: sh-sci: Fix race condition causing garbage during shutdown"), it does not terminate a transmit DMA operation that may be in progress. Fix this by terminating any pending DMA operations, and resetting the corresponding cookie. Signed-off-by: Geert Uytterhoeven Reviewed-by: Eugeniu Rosca Tested-by: Eugeniu Rosca Link: https://lore.kernel.org/r/20190624123540.20629-3-geert+renesas@glider.be Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/sh-sci.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 040832635a64..71f12601e693 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1633,11 +1633,18 @@ static void sci_free_dma(struct uart_port *port) static void sci_flush_buffer(struct uart_port *port) { + struct sci_port *s = to_sci_port(port); + /* * In uart_flush_buffer(), the xmit circular buffer has just been - * cleared, so we have to reset tx_dma_len accordingly. + * cleared, so we have to reset tx_dma_len accordingly, and stop any + * pending transfers */ - to_sci_port(port)->tx_dma_len = 0; + s->tx_dma_len = 0; + if (s->chan_tx) { + dmaengine_terminate_async(s->chan_tx); + s->cookie_tx = -EINVAL; + } } #else /* !CONFIG_SERIAL_SH_SCI_DMA */ static inline void sci_request_dma(struct uart_port *port) -- 2.20.1