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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 C2B48C433E1 for ; Tue, 9 Jun 2020 17:47:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 924AE2081A for ; Tue, 9 Jun 2020 17:47:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591724830; bh=vQz5uSiKzqmVGiwcla8GBB0B8mU94hU5bML76SFcTO8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=1dZSq531E2zpjH6QoTOOv4D8FpJiR08kj1uTzFU4eDriTpkDIVU6mrReIFjR98MDs YzauWNlWXRzMVpd/lwdKsCLdnwSBmRM9U7Thk6UbOqtFtXvxRT2rRvnxtLQDVOlPSn UHc2zuadj9WJb/YdgrTm5DBwmVvabTj35sT+WSww= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732055AbgFIRrI (ORCPT ); Tue, 9 Jun 2020 13:47:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:57838 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731163AbgFIRq7 (ORCPT ); Tue, 9 Jun 2020 13:46:59 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B37EF207ED; Tue, 9 Jun 2020 17:46:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591724819; bh=vQz5uSiKzqmVGiwcla8GBB0B8mU94hU5bML76SFcTO8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NIVXQZFh2sZmPNm7ndpe23mjI1EAhLN2ruTfp/+VmvWpw2zk/2/3Iy5SeUfk6bO1k ugyze1dSm0Jf6rFXBo6uBr8KUlG0LuTfNvrdZBj9vQncX23YqvtvB6cvO9iE0YFIP7 SLpA/NDtN8upMjy6n0u+/W/sH766ZGk7PSw01MWI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Valentin Longchamp , Matteo Ghidoni , "David S. Miller" , Sasha Levin Subject: [PATCH 4.4 12/36] net/ethernet/freescale: rework quiesce/activate for ucc_geth Date: Tue, 9 Jun 2020 19:44:12 +0200 Message-Id: <20200609173933.983120800@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200609173933.288044334@linuxfoundation.org> References: <20200609173933.288044334@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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 55ac00055977..96a1f62cc148 100644 --- a/drivers/net/ethernet/freescale/ucc_geth.c +++ b/drivers/net/ethernet/freescale/ucc_geth.c @@ -45,6 +45,7 @@ #include #include #include +#include #include "ucc_geth.h" @@ -1551,11 +1552,8 @@ 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); @@ -1568,7 +1566,10 @@ 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