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=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 498E7C3F2D7 for ; Thu, 5 Mar 2020 17:15:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 212222166E for ; Thu, 5 Mar 2020 17:15:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583428520; bh=apxNGTTawxO88AhaRt5S23Z7rTLns5Lk95jgyvF3/SA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=sm5yixORfA/gsBgrtZIJ1SIVXZTvfxGSn2sbm/Xrs8fS7ccoEMTYNjNgKr0JmVBA9 ovcPvd1qvy1W07ddE8ZFoXh1ICKLBeL4+UzGbaArBI3R0ErQyUnwROIMd/zNDZLsfp XooRA/3h9xSTpWu3cPQuyS/YcAVt+Le1GoZroQp8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728010AbgCERPT (ORCPT ); Thu, 5 Mar 2020 12:15:19 -0500 Received: from mail.kernel.org ([198.145.29.99]:41518 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727902AbgCERPA (ORCPT ); Thu, 5 Mar 2020 12:15:00 -0500 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 3977121744; Thu, 5 Mar 2020 17:14:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583428500; bh=apxNGTTawxO88AhaRt5S23Z7rTLns5Lk95jgyvF3/SA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CoZOH9iOeGrfO+vDOpcrnzac+irrY91dazaVwZriKToLGNwtlgUi3DDUWiMnFSbQD Tfl9c25LxVyTRVCOkQBMx3g1by2Q7nL570oWIpqwKaG+Kq4ZuI75/Bc2wpDxuwcIO8 KM0OIfun/IBvIVsibjBjFowDy/nTBbj9aVhBcj0E= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Esben Haabendal , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 5.4 31/58] net: ll_temac: Fix race condition causing TX hang Date: Thu, 5 Mar 2020 12:13:52 -0500 Message-Id: <20200305171420.29595-31-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200305171420.29595-1-sashal@kernel.org> References: <20200305171420.29595-1-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: Esben Haabendal [ Upstream commit 84823ff80f7403752b59e00bb198724100dc611c ] It is possible that the interrupt handler fires and frees up space in the TX ring in between checking for sufficient TX ring space and stopping the TX queue in temac_start_xmit. If this happens, the queue wake from the interrupt handler will occur before the queue is stopped, causing a lost wakeup and the adapter's transmit hanging. To avoid this, after stopping the queue, check again whether there is sufficient space in the TX ring. If so, wake up the queue again. This is a port of the similar fix in axienet driver, commit 7de44285c1f6 ("net: axienet: Fix race condition causing TX hang"). Fixes: 23ecc4bde21f ("net: ll_temac: fix checksum offload logic") Signed-off-by: Esben Haabendal Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/xilinx/ll_temac_main.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c index 21c1b4322ea78..fd578568b3bff 100644 --- a/drivers/net/ethernet/xilinx/ll_temac_main.c +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c @@ -788,6 +788,9 @@ static void temac_start_xmit_done(struct net_device *ndev) stat = be32_to_cpu(cur_p->app0); } + /* Matches barrier in temac_start_xmit */ + smp_mb(); + netif_wake_queue(ndev); } @@ -830,9 +833,19 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev) cur_p = &lp->tx_bd_v[lp->tx_bd_tail]; if (temac_check_tx_bd_space(lp, num_frag + 1)) { - if (!netif_queue_stopped(ndev)) - netif_stop_queue(ndev); - return NETDEV_TX_BUSY; + if (netif_queue_stopped(ndev)) + return NETDEV_TX_BUSY; + + netif_stop_queue(ndev); + + /* Matches barrier in temac_start_xmit_done */ + smp_mb(); + + /* Space might have just been freed - check again */ + if (temac_check_tx_bd_space(lp, num_frag)) + return NETDEV_TX_BUSY; + + netif_wake_queue(ndev); } cur_p->app0 = 0; -- 2.20.1 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=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, 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 74DC5C3F2D2 for ; Thu, 5 Mar 2020 17:15:35 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3B18F217F4 for ; Thu, 5 Mar 2020 17:15:35 +0000 (UTC) Authentication-Results: mail.kernel.org; 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b=TB0GMQ3xcdHT7D pOfvtd5AsyxrgW/89jQVtY09eFi0hr192cVi6zKTDpPAbD0Vutsqc4YfZNF6cfB9/bhL6HD+0Ar1x QIgFR9VtGo7oOwdGWgiuuw+Djh7xmnB/QogrTqeiy6ApP9z//0qRQksaim/06D2TrDlG/pWKEma/c Dz4qSzQ9brGNTRHmEJFnY7R4RWNrbnuvdIF+yGe5ovsfxoXdTH8uCNb68VCI9hkyRoDffS2dzjmkJ vygIv2KXqUbRXklrw0gy4oZRWEivF+5eRlFXV7HIUBtUhcfe029eX0z9H8ZLUKocbUbTPjVmd0hFe YvWEolm4vUowLZ1FZ3Fg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j9u5r-0004p0-JQ; Thu, 05 Mar 2020 17:15:31 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1j9u5M-0003Dq-9l for linux-arm-kernel@lists.infradead.org; Thu, 05 Mar 2020 17:15:01 +0000 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 3977121744; Thu, 5 Mar 2020 17:14:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583428500; bh=apxNGTTawxO88AhaRt5S23Z7rTLns5Lk95jgyvF3/SA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CoZOH9iOeGrfO+vDOpcrnzac+irrY91dazaVwZriKToLGNwtlgUi3DDUWiMnFSbQD Tfl9c25LxVyTRVCOkQBMx3g1by2Q7nL570oWIpqwKaG+Kq4ZuI75/Bc2wpDxuwcIO8 KM0OIfun/IBvIVsibjBjFowDy/nTBbj9aVhBcj0E= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 31/58] net: ll_temac: Fix race condition causing TX hang Date: Thu, 5 Mar 2020 12:13:52 -0500 Message-Id: <20200305171420.29595-31-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200305171420.29595-1-sashal@kernel.org> References: <20200305171420.29595-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200305_091500_416962_EFE807A7 X-CRM114-Status: GOOD ( 13.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , netdev@vger.kernel.org, Esben Haabendal , "David S . Miller" , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Esben Haabendal [ Upstream commit 84823ff80f7403752b59e00bb198724100dc611c ] It is possible that the interrupt handler fires and frees up space in the TX ring in between checking for sufficient TX ring space and stopping the TX queue in temac_start_xmit. If this happens, the queue wake from the interrupt handler will occur before the queue is stopped, causing a lost wakeup and the adapter's transmit hanging. To avoid this, after stopping the queue, check again whether there is sufficient space in the TX ring. If so, wake up the queue again. This is a port of the similar fix in axienet driver, commit 7de44285c1f6 ("net: axienet: Fix race condition causing TX hang"). Fixes: 23ecc4bde21f ("net: ll_temac: fix checksum offload logic") Signed-off-by: Esben Haabendal Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/xilinx/ll_temac_main.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c index 21c1b4322ea78..fd578568b3bff 100644 --- a/drivers/net/ethernet/xilinx/ll_temac_main.c +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c @@ -788,6 +788,9 @@ static void temac_start_xmit_done(struct net_device *ndev) stat = be32_to_cpu(cur_p->app0); } + /* Matches barrier in temac_start_xmit */ + smp_mb(); + netif_wake_queue(ndev); } @@ -830,9 +833,19 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev) cur_p = &lp->tx_bd_v[lp->tx_bd_tail]; if (temac_check_tx_bd_space(lp, num_frag + 1)) { - if (!netif_queue_stopped(ndev)) - netif_stop_queue(ndev); - return NETDEV_TX_BUSY; + if (netif_queue_stopped(ndev)) + return NETDEV_TX_BUSY; + + netif_stop_queue(ndev); + + /* Matches barrier in temac_start_xmit_done */ + smp_mb(); + + /* Space might have just been freed - check again */ + if (temac_check_tx_bd_space(lp, num_frag)) + return NETDEV_TX_BUSY; + + netif_wake_queue(ndev); } cur_p->app0 = 0; -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel