From patchwork Fri Jun 5 14:14:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 224762 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,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 71CD2C433DF for ; Fri, 5 Jun 2020 14:25:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 534A120663 for ; Fri, 5 Jun 2020 14:25:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591367102; bh=K7lgPnmnyd9zaQE8Biv09xlGJPFmPcPUvqaqpNNNsKY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xiusMfsv7QccIqMPoUp53aq1yCwAwnTnSbATUoKEBybt1uUYvUHInpUIcqzelrqd3 8vQ4h+SYnYFVBqt9QU5lZ1QCSqDH2J9limLx4bVI9ug4G1yL0p+lkmJBYcwVPNQsi/ kjFve3j8tBpLBF8i+FnI/SIaXGi0POUCrlpUnVKs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728845AbgFEOY5 (ORCPT ); Fri, 5 Jun 2020 10:24:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:46262 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728364AbgFEORA (ORCPT ); Fri, 5 Jun 2020 10:17:00 -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 CCF28206A2; Fri, 5 Jun 2020 14:16:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591366619; bh=K7lgPnmnyd9zaQE8Biv09xlGJPFmPcPUvqaqpNNNsKY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DCqEhtklUEc7a2CUP9F8iqd21F1eb5dT8K8L0anlZ+Vqh9D9kSubcMWztXm5wiwBu dBf37rrjw8Uq+Ga+h7v3EXHefk4vbOBTPH1uRpm7cTPetbvFhDFU907QkS+b1iH5Bi sbP7j3dqG1J+w6br79T8JxsApVbdBYd6MjYUgFPo= 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 5.6 26/43] net/ethernet/freescale: rework quiesce/activate for ucc_geth Date: Fri, 5 Jun 2020 16:14:56 +0200 Message-Id: <20200605140153.894270623@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200605140152.493743366@linuxfoundation.org> References: <20200605140152.493743366@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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