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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 832D7C433FE for ; Mon, 24 Jan 2022 12:48:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240369AbiAXMsT (ORCPT ); Mon, 24 Jan 2022 07:48:19 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:52096 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234753AbiAXMsS (ORCPT ); Mon, 24 Jan 2022 07:48:18 -0500 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 ams.source.kernel.org (Postfix) with ESMTPS id 97202B80F98 for ; Mon, 24 Jan 2022 12:48:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9C0B2C340E1; Mon, 24 Jan 2022 12:48:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1643028496; bh=4eWNEaXSF+eLMswopYYS7mW2+zjQWitPmIOD1ph3g5s=; h=Subject:To:Cc:From:Date:From; b=eex6Uw5b2+cIEuJ53gBUS7KTFNMmIFkCpRy7bCJa1L/wbUU1vEG4XwQzWkhns4iWG bJZAPkZesFgr+UB9fXP2B+BuQQ5riMmRUzpWEpFO8r9WZxEcCe7x15uTSOnYgOQyRq X346kEwGYdJnzxkEfr6Odnhg1H+yq/4aXWQF0qTE= Subject: FAILED: patch "[PATCH] net: axienet: add missing memory barriers" failed to apply to 4.4-stable tree To: robert.hancock@calian.com, davem@davemloft.net Cc: From: Date: Mon, 24 Jan 2022 13:47:58 +0100 Message-ID: <16430284782837@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 95978df6fa328df619c15312e65ece469c2be2d2 Mon Sep 17 00:00:00 2001 From: Robert Hancock Date: Tue, 18 Jan 2022 15:41:27 -0600 Subject: [PATCH] net: axienet: add missing memory barriers This driver was missing some required memory barriers: Use dma_rmb to ensure we see all updates to the descriptor after we see that an entry has been completed. Use wmb and rmb to avoid stale descriptor status between the TX path and TX complete IRQ path. Fixes: 8a3b7a252dca9 ("drivers/net/ethernet/xilinx: added Xilinx AXI Ethernet driver") Signed-off-by: Robert Hancock Signed-off-by: David S. Miller diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c index 53ff38cbc37b..fb486a457c76 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c @@ -632,6 +632,8 @@ static int axienet_free_tx_chain(struct net_device *ndev, u32 first_bd, if (nr_bds == -1 && !(status & XAXIDMA_BD_STS_COMPLETE_MASK)) break; + /* Ensure we see complete descriptor update */ + dma_rmb(); phys = desc_get_phys_addr(lp, cur_p); dma_unmap_single(ndev->dev.parent, phys, (cur_p->cntrl & XAXIDMA_BD_CTRL_LENGTH_MASK), @@ -645,8 +647,10 @@ static int axienet_free_tx_chain(struct net_device *ndev, u32 first_bd, cur_p->app1 = 0; cur_p->app2 = 0; cur_p->app4 = 0; - cur_p->status = 0; cur_p->skb = NULL; + /* ensure our transmit path and device don't prematurely see status cleared */ + wmb(); + cur_p->status = 0; if (sizep) *sizep += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK; @@ -704,6 +708,9 @@ static inline int axienet_check_tx_bd_space(struct axienet_local *lp, int num_frag) { struct axidma_bd *cur_p; + + /* Ensure we see all descriptor updates from device or TX IRQ path */ + rmb(); cur_p = &lp->tx_bd_v[(lp->tx_bd_tail + num_frag) % lp->tx_bd_num]; if (cur_p->status & XAXIDMA_BD_STS_ALL_MASK) return NETDEV_TX_BUSY; @@ -843,6 +850,8 @@ static void axienet_recv(struct net_device *ndev) tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci; + /* Ensure we see complete descriptor update */ + dma_rmb(); phys = desc_get_phys_addr(lp, cur_p); dma_unmap_single(ndev->dev.parent, phys, lp->max_frm_size, DMA_FROM_DEVICE);