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 47455C433E1 for ; Thu, 28 May 2020 12:08:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2424821548 for ; Thu, 28 May 2020 12:08:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590667723; bh=K7lgPnmnyd9zaQE8Biv09xlGJPFmPcPUvqaqpNNNsKY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=TnjgqrK+5T8wxUj9+MeQ309WY3U7IW55rOWRDCJ7bAgO+JRkSyYjSc3EX1k/f0vpJ vt01GquTma5NXG473PVg38+pG9AXJgUYwXX/8nCP9XhFhvCDeLF916V9cR0Kfighov hLH80vWbxrJ33NprWk3fVPd/ZDFXyZOyicaN1sNs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389419AbgE1MIl (ORCPT ); Thu, 28 May 2020 08:08:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:48612 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388769AbgE1L4f (ORCPT ); Thu, 28 May 2020 07:56:35 -0400 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 1FC8020DD4; Thu, 28 May 2020 11:56:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590666995; bh=K7lgPnmnyd9zaQE8Biv09xlGJPFmPcPUvqaqpNNNsKY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jKT4rEJnVSgVj1rAi1sBSz6+ZavTbFy743Tw0jg/N3SnCu0XHijX+MgHUUucvGTYl QGeVN2VwGiDBPQFqOSUm39wcwas4yr/VfcrLWUEmikSzjk/Ea12GllV8TB6H8Ca8Rn 41BeDr6iIE9IfsoPi+gHsLdU0YbrEApUVcdKPzo8= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Valentin Longchamp , Matteo Ghidoni , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 5.6 30/47] net/ethernet/freescale: rework quiesce/activate for ucc_geth Date: Thu, 28 May 2020 07:55:43 -0400 Message-Id: <20200528115600.1405808-30-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200528115600.1405808-1-sashal@kernel.org> References: <20200528115600.1405808-1-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: Valentin Longchamp [ Upstream commit 79dde73cf9bcf1dd317a2667f78b758e9fe139ed ] ugeth_quiesce/activate are used to halt the controller when there is a link change that requires to reconfigure the mac. The previous implementation called netif_device_detach(). This however causes the initial activation of the netdevice to fail precisely because it's detached. For details, see [1]. A possible workaround was the revert of commit net: linkwatch: add check for netdevice being present to linkwatch_do_dev However, the check introduced in the above commit is correct and shall be kept. The netif_device_detach() is thus replaced with netif_tx_stop_all_queues() that prevents any tranmission. This allows to perform mac config change required by the link change, without detaching the corresponding netdevice and thus not preventing its initial activation. [1] https://lists.openwall.net/netdev/2020/01/08/201 Signed-off-by: Valentin Longchamp Acked-by: Matteo Ghidoni Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/freescale/ucc_geth.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/freescale/ucc_geth.c b/drivers/net/ethernet/freescale/ucc_geth.c index 0d101c00286f..ab1b4a77b4a3 100644 --- a/drivers/net/ethernet/freescale/ucc_geth.c +++ b/drivers/net/ethernet/freescale/ucc_geth.c @@ -42,6 +42,7 @@ #include #include #include +#include #include "ucc_geth.h" @@ -1548,11 +1549,8 @@ static int ugeth_disable(struct ucc_geth_private *ugeth, enum comm_dir mode) static void ugeth_quiesce(struct ucc_geth_private *ugeth) { - /* Prevent any further xmits, plus detach the device. */ - netif_device_detach(ugeth->ndev); - - /* Wait for any current xmits to finish. */ - netif_tx_disable(ugeth->ndev); + /* Prevent any further xmits */ + netif_tx_stop_all_queues(ugeth->ndev); /* Disable the interrupt to avoid NAPI rescheduling. */ disable_irq(ugeth->ug_info->uf_info.irq); @@ -1565,7 +1563,10 @@ static void ugeth_activate(struct ucc_geth_private *ugeth) { napi_enable(&ugeth->napi); enable_irq(ugeth->ug_info->uf_info.irq); - netif_device_attach(ugeth->ndev); + + /* allow to xmit again */ + netif_tx_wake_all_queues(ugeth->ndev); + __netdev_watchdog_up(ugeth->ndev); } /* Called every time the controller might need to be made -- 2.25.1