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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 53A2AC48BE5 for ; Mon, 21 Jun 2021 18:05:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E05D61245 for ; Mon, 21 Jun 2021 18:05:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233041AbhFUSIH (ORCPT ); Mon, 21 Jun 2021 14:08:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:47246 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234320AbhFUSFF (ORCPT ); Mon, 21 Jun 2021 14:05:05 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9101C61370; Mon, 21 Jun 2021 17:56:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624298181; bh=N1HyRh+smJA+KgiA9Llg+9G9JVCUrbjQdQkAgZgjwRs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YmS2Ptwm/5vvgxilPh/7j/7n0TThoJ4eLed3ioy1d+7uM+WTuGp73bp4a2OdLEZlO gRD3Ci/FgUsquS+vO/q6CD4URPTgR1oH4qFlnvrYpoXBOGSLTKVTMjmo+FILpUKKWi 4iWnjoMq72W5Lr8eY0Iaa5W6/RAO+HUrZxAR6PCyBSxuxbdBb0jlUt0ady7tzyU4m/ vMSvZqxoI89+fWMt+Zjrb8A3u9uFgJTKU0hZos9IvDrZPj7qNH1gGiMU43eoWBRjvq wJKjZ09o/RzhEISQcUY83SnhtqXXVyfkSzUtPK3mvkL8p+/z3RKdvdC17Rl+lu2e54 RoKc4niumoyYQ== 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 4.4 9/9] net: ll_temac: Avoid ndo_start_xmit returning NETDEV_TX_BUSY Date: Mon, 21 Jun 2021 13:56:07 -0400 Message-Id: <20210621175608.736581-9-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210621175608.736581-1-sashal@kernel.org> References: <20210621175608.736581-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Esben Haabendal [ Upstream commit f6396341194234e9b01cd7538bc2c6ac4501ab14 ] As documented in Documentation/networking/driver.rst, the ndo_start_xmit method must not return NETDEV_TX_BUSY under any normal circumstances, and as recommended, we simply stop the tx queue in advance, when there is a risk that the next xmit would cause a NETDEV_TX_BUSY return. Signed-off-by: Esben Haabendal Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/xilinx/ll_temac_main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c index ed6a88cf3281..98a1c712b62a 100644 --- a/drivers/net/ethernet/xilinx/ll_temac_main.c +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c @@ -735,6 +735,11 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev) /* Kick off the transfer */ lp->dma_out(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */ + if (temac_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1)) { + netdev_info(ndev, "%s -> netif_stop_queue\n", __func__); + netif_stop_queue(ndev); + } + return NETDEV_TX_OK; } -- 2.30.2