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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA098C433FE for ; Tue, 1 Mar 2022 20:16:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237869AbiCAURK (ORCPT ); Tue, 1 Mar 2022 15:17:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237898AbiCAUQq (ORCPT ); Tue, 1 Mar 2022 15:16:46 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DD6627E081; Tue, 1 Mar 2022 12:15:56 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 7437161725; Tue, 1 Mar 2022 20:15:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50981C36AE5; Tue, 1 Mar 2022 20:15:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1646165755; bh=pw0Qj8vjosGWO4vo4tauge3HBJo809oseTBs39UMTuE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Cf7WkDdcPErdbHz/jdnLHgVJNSLfl9pSkBiaMGC1lNYzB8h1v31LWuSWZSM+gMDj1 vmYEzRbTZ5khT8T3mmm4R9YpzmbkJItVqvSR9PPhV1RwxiX7tDfh61zykTOBx3FeCk G5Fa6+VrzjanTRkm/ty/KssRR1q4C6bbOq1IGW5Ohzwfg2pl00bafpZas3pGzROlmu wnvGVihkVDYJDAC7YInCZi5HuJhZzVsyNai389IcEotROQscbuOr415k3+9JEYctRg SXZ4NmcV6mouTa3e9zJVPz6o6/qRq8kmmK/lG/XPmRtR4EobzkFmk6DlYAArX/Ocio sboPtiqgsyl0w== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= , Paul Durrant , Michael Brown , Jakub Kicinski , Sasha Levin , wei.liu@kernel.org, davem@davemloft.net, xen-devel@lists.xenproject.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.16 22/28] Revert "xen-netback: Check for hotplug-status existence before watching" Date: Tue, 1 Mar 2022 15:13:27 -0500 Message-Id: <20220301201344.18191-22-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220301201344.18191-1-sashal@kernel.org> References: <20220301201344.18191-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Marek Marczykowski-Górecki [ Upstream commit e8240addd0a3919e0fd7436416afe9aa6429c484 ] This reverts commit 2afeec08ab5c86ae21952151f726bfe184f6b23d. The reasoning in the commit was wrong - the code expected to setup the watch even if 'hotplug-status' didn't exist. In fact, it relied on the watch being fired the first time - to check if maybe 'hotplug-status' is already set to 'connected'. Not registering a watch for non-existing path (which is the case if hotplug script hasn't been executed yet), made the backend not waiting for the hotplug script to execute. This in turns, made the netfront think the interface is fully operational, while in fact it was not (the vif interface on xen-netback side might not be configured yet). This was a workaround for 'hotplug-status' erroneously being removed. But since that is reverted now, the workaround is not necessary either. More discussion at https://lore.kernel.org/xen-devel/afedd7cb-a291-e773-8b0d-4db9b291fa98@ipxe.org/T/#u Signed-off-by: Marek Marczykowski-Górecki Reviewed-by: Paul Durrant Reviewed-by: Michael Brown Link: https://lore.kernel.org/r/20220222001817.2264967-2-marmarek@invisiblethingslab.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/xen-netback/xenbus.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c index 3fad58d22155b..990360d75cb64 100644 --- a/drivers/net/xen-netback/xenbus.c +++ b/drivers/net/xen-netback/xenbus.c @@ -824,15 +824,11 @@ static void connect(struct backend_info *be) xenvif_carrier_on(be->vif); unregister_hotplug_status_watch(be); - if (xenbus_exists(XBT_NIL, dev->nodename, "hotplug-status")) { - err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, - NULL, hotplug_status_changed, - "%s/%s", dev->nodename, - "hotplug-status"); - if (err) - goto err; + err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch, NULL, + hotplug_status_changed, + "%s/%s", dev->nodename, "hotplug-status"); + if (!err) be->have_hotplug_status_watch = 1; - } netif_tx_wake_all_queues(be->vif->dev); -- 2.34.1