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,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 575BFC4360F for ; Thu, 4 Apr 2019 09:17:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 19B8B2054F for ; Thu, 4 Apr 2019 09:17:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554369424; bh=ZYwuX9MFDE6QiZCoOQuu/78SQjmpK632CIsUb1U/G7A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=dU1D3MT3mcPG+lzQu1jbUbNvacXVZh/SJ83ts5e8iBPg5zaf04bUQ7oosdblH4HrB CMQvVCaUBuOghvCiSk6taJbfJqvzTItOtbKePoYMHr0KK38fIUq8fgUZxFjc6y3bK9 tnlYBuMdsMEBWO4d3GAj0d3ozQMvbz86BNncdoFc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388152AbfDDJRD (ORCPT ); Thu, 4 Apr 2019 05:17:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:58378 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387927AbfDDJQ7 (ORCPT ); Thu, 4 Apr 2019 05:16:59 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 5130521734; Thu, 4 Apr 2019 09:16:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554369417; bh=ZYwuX9MFDE6QiZCoOQuu/78SQjmpK632CIsUb1U/G7A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HLLaz/OfZMD6TQLjlF1tK+ikL0O1J0PPPhZxNTPeUXcfS5fPI3YmkRdKu7bmWQhHS ifwN4INnk+gEcacA1pp3d7x2J1jbLUKTtWbOJqBbMBzIQj0JcEylE1Ovw0DpiENJPy lUX61lrY9EKkSvJ/zHXV7utzF/jUzqeW/F7+K9gY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Joey Zheng , Sinan Kaya , Shunyong Yang , Vinod Koul , Sasha Levin Subject: [PATCH 5.0 216/246] dmaengine: qcom_hidma: assign channel cookie correctly Date: Thu, 4 Apr 2019 10:48:36 +0200 Message-Id: <20190404084626.756696128@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190404084619.236418459@linuxfoundation.org> References: <20190404084619.236418459@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 5.0-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 546c0547555efca8ba8c120716c325435e29df1b ] When dma_cookie_complete() is called in hidma_process_completed(), dma_cookie_status() will return DMA_COMPLETE in hidma_tx_status(). Then, hidma_txn_is_success() will be called to use channel cookie mchan->last_success to do additional DMA status check. Current code assigns mchan->last_success after dma_cookie_complete(). This causes a race condition of dma_cookie_status() returns DMA_COMPLETE before mchan->last_success is assigned correctly. The race will cause hidma_tx_status() return DMA_ERROR but the transaction is actually a success. Moreover, in async_tx case, it will cause a timeout panic in async_tx_quiesce(). Kernel panic - not syncing: async_tx_quiesce: DMA error waiting for transaction ... Call trace: [] dump_backtrace+0x0/0x1f4 [] show_stack+0x24/0x2c [] dump_stack+0x84/0xa8 [] panic+0x12c/0x29c [] async_tx_quiesce+0xa4/0xc8 [async_tx] [] async_trigger_callback+0x70/0x1c0 [async_tx] [] raid_run_ops+0x86c/0x1540 [raid456] [] handle_stripe+0x5e8/0x1c7c [raid456] [] handle_active_stripes.isra.45+0x2d4/0x550 [raid456] [] raid5d+0x38c/0x5d0 [raid456] [] md_thread+0x108/0x168 [] kthread+0x10c/0x138 [] ret_from_fork+0x10/0x18 Cc: Joey Zheng Reviewed-by: Sinan Kaya Signed-off-by: Shunyong Yang Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/qcom/hidma.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c index 43d4b00b8138..ea219bca116d 100644 --- a/drivers/dma/qcom/hidma.c +++ b/drivers/dma/qcom/hidma.c @@ -138,24 +138,25 @@ static void hidma_process_completed(struct hidma_chan *mchan) desc = &mdesc->desc; last_cookie = desc->cookie; + llstat = hidma_ll_status(mdma->lldev, mdesc->tre_ch); + spin_lock_irqsave(&mchan->lock, irqflags); + if (llstat == DMA_COMPLETE) { + mchan->last_success = last_cookie; + result.result = DMA_TRANS_NOERROR; + } else { + result.result = DMA_TRANS_ABORTED; + } + dma_cookie_complete(desc); spin_unlock_irqrestore(&mchan->lock, irqflags); - llstat = hidma_ll_status(mdma->lldev, mdesc->tre_ch); dmaengine_desc_get_callback(desc, &cb); dma_run_dependencies(desc); spin_lock_irqsave(&mchan->lock, irqflags); list_move(&mdesc->node, &mchan->free); - - if (llstat == DMA_COMPLETE) { - mchan->last_success = last_cookie; - result.result = DMA_TRANS_NOERROR; - } else - result.result = DMA_TRANS_ABORTED; - spin_unlock_irqrestore(&mchan->lock, irqflags); dmaengine_desc_callback_invoke(&cb, &result); -- 2.19.1