From nobody Fri Oct 17 10:31:36 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7769C433FE for ; Wed, 19 Oct 2022 09:12:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232943AbiJSJMh (ORCPT ); Wed, 19 Oct 2022 05:12:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232984AbiJSJJv (ORCPT ); Wed, 19 Oct 2022 05:09:51 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A0979F362; Wed, 19 Oct 2022 02:00:54 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 37E6161800; Wed, 19 Oct 2022 09:00:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 48AA1C433C1; Wed, 19 Oct 2022 09:00:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666170053; bh=+vbNUCQv8UUCMwCDsqLsnnb70lWBjwdQNQ0Y+msAdpk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zb8GnXL1b8j3+3WvQprX8M8FBws05KrrMigCJmVVTpElmFYyWw7eLy+zS3PVKX6fn hukBDEEA8TaQv73/bvRCK/0NSnBsTc7u/ao/q/mBJ70wf+eL2GQ56xnKiIiH0G8pa1 pyuAyDGMcvtMVMaIuhE37pN6tFPl6VFYhRsIFw5w= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jie Hai , Zhou Wang , Vinod Koul , Sasha Levin Subject: [PATCH 6.0 509/862] dmaengine: hisilicon: Fix CQ head update Date: Wed, 19 Oct 2022 10:29:56 +0200 Message-Id: <20221019083312.477351647@linuxfoundation.org> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221019083249.951566199@linuxfoundation.org> References: <20221019083249.951566199@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Jie Hai [ Upstream commit 94477a79cf80e8ab55b68f14bc579a12ddea1e0b ] After completion of data transfer of one or multiple descriptors, the completion status and the current head pointer to submission queue are written into the CQ and interrupt can be generated to inform the software. In interrupt process CQ is read and cq_head is updated. hisi_dma_irq updates cq_head only when the completion status is success. When an abnormal interrupt reports, cq_head will not update which will cause subsequent interrupt processes read the error CQ and never report the correct status. This patch updates cq_head whenever CQ is accessed. Fixes: e9f08b65250d ("dmaengine: hisilicon: Add Kunpeng DMA engine support") Signed-off-by: Jie Hai Acked-by: Zhou Wang Link: https://lore.kernel.org/r/20220830062251.52993-3-haijie1@huawei.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/hisi_dma.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/dma/hisi_dma.c b/drivers/dma/hisi_dma.c index 98bc488893cc..837f7e4adfa6 100644 --- a/drivers/dma/hisi_dma.c +++ b/drivers/dma/hisi_dma.c @@ -436,12 +436,10 @@ static irqreturn_t hisi_dma_irq(int irq, void *data) desc =3D chan->desc; cqe =3D chan->cq + chan->cq_head; if (desc) { + chan->cq_head =3D (chan->cq_head + 1) % hdma_dev->chan_depth; + hisi_dma_chan_write(hdma_dev->base, HISI_DMA_CQ_HEAD_PTR, + chan->qp_num, chan->cq_head); if (FIELD_GET(STATUS_MASK, cqe->w0) =3D=3D STATUS_SUCC) { - chan->cq_head =3D (chan->cq_head + 1) % - hdma_dev->chan_depth; - hisi_dma_chan_write(hdma_dev->base, - HISI_DMA_CQ_HEAD_PTR, chan->qp_num, - chan->cq_head); vchan_cookie_complete(&desc->vd); } else { dev_err(&hdma_dev->pdev->dev, "task error!\n"); --=20 2.35.1