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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0F56CC28CF4 for ; Tue, 16 Nov 2021 11:21:58 +0000 (UTC) Received: from vger.kernel.org (unknown [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D52B261055 for ; Tue, 16 Nov 2021 11:21:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org D52B261055 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=microchip.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234951AbhKPLYw (ORCPT ); Tue, 16 Nov 2021 06:24:52 -0500 Received: from esa.microchip.iphmx.com ([68.232.153.233]:3771 "EHLO esa.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234908AbhKPLYB (ORCPT ); Tue, 16 Nov 2021 06:24:01 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1637061665; x=1668597665; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5xHR1pSMET19iq1R2ORya7V1yqiD9c113vKBUFK5yTw=; b=U1YFmQ5AnSAKEHVmssrZAqJiNwlV3zBa3wN9FQefYFVf0OAwQiU5y+dz EYpuialrpWagzhRkibhmjSCNZ0pMTCJvBtNYX4BVrYV+jyFUzHY0lFc55 WEiEKxnrXpxtLk5FsjArHxKahDLgv1Ya2uXKaQSNvcz2rZVRFCCIMjbi9 nylsS7hzwGJw4zmjEssyWFC4fIrGvjZmI0qxUHZHYBtYlMqq2KcvqY5vx wuIujdJFnKv6dEPMohdPGJe/vPWpKanW8iZM/S4lQI5Pna4DxWdbR7gmk 1n4hMy2KeQT/aWh6au/L2gS8r9gIjpWpS8fbOAaMy9ukZ39G44/xwq813 g==; IronPort-SDR: nEaswDJg6UvN1Ak1k5snxDBueJXCkjA/TZHVY+1/T2B1dAY07tQGG1LrfRuZa9m+38lrF9XE0P lKna2Wl5adWWKHh/HCQ3jNYY7/wZmbI7calkFrXuiDctO/acd4xL3gHUMYLixQoumL3wgP3HRz i8KsDoOBZB83LdFviPxl7FyfGzE8ZSUseaKNR/ws+hrHJ+qfTCCfDzF+9W19ycXtRH/yVsQfXh mYe9HJf/p4+BhHSyqyAKvQY/Wd5pnsCAb1HE/Ua7Ir3jOAjSVIdpQugbcclg/axCOctF9ta0IR 94LEaPFwvDU5xku5ARpCm85x X-IronPort-AV: E=Sophos;i="5.87,239,1631602800"; d="scan'208";a="143500780" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa5.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 16 Nov 2021 04:21:04 -0700 Received: from chn-vm-ex04.mchp-main.com (10.10.85.152) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.14; Tue, 16 Nov 2021 04:21:03 -0700 Received: from ROB-ULT-M18064N.mchp-main.com (10.10.115.15) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server id 15.1.2176.14 via Frontend Transport; Tue, 16 Nov 2021 04:21:00 -0700 From: Tudor Ambarus To: , , , , CC: , , , , , , , Tudor Ambarus Subject: [PATCH 06/13] dmaengine: at_xdmac: Fix concurrency over chan's completed_cookie Date: Tue, 16 Nov 2021 13:20:29 +0200 Message-ID: <20211116112036.96349-7-tudor.ambarus@microchip.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211116112036.96349-1-tudor.ambarus@microchip.com> References: <20211116112036.96349-1-tudor.ambarus@microchip.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Caller of dma_cookie_complete is expected to hold a lock to prevent concurrency over the channel's completed cookie marker. Fixes: e1f7c9eee707 ("dmaengine: at_xdmac: creation of the atmel eXtended DMA Controller driver") Signed-off-by: Tudor Ambarus --- drivers/dma/at_xdmac.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index b45ae4fee9db..4d8476845c20 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -1703,11 +1703,10 @@ static void at_xdmac_tasklet(struct tasklet_struct *t) } txd = &desc->tx_dma_desc; - + dma_cookie_complete(txd); at_xdmac_remove_xfer(atchan, desc); spin_unlock_irq(&atchan->lock); - dma_cookie_complete(txd); if (txd->flags & DMA_PREP_INTERRUPT) dmaengine_desc_get_callback_invoke(txd, NULL); -- 2.25.1