From patchwork Mon Feb 21 03:42:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marek_Marczykowski-G=C3=B3recki?= X-Patchwork-Id: 12753000 X-Patchwork-Delegate: kuba@kernel.org 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 D4067C433EF for ; Mon, 21 Feb 2022 03:42:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344356AbiBUDnH (ORCPT ); Sun, 20 Feb 2022 22:43:07 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:44220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232812AbiBUDnG (ORCPT ); Sun, 20 Feb 2022 22:43:06 -0500 Received: from wout3-smtp.messagingengine.com (wout3-smtp.messagingengine.com [64.147.123.19]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DCA073C70E; Sun, 20 Feb 2022 19:42:43 -0800 (PST) Received: from compute2.internal (compute2.nyi.internal [10.202.2.46]) by mailout.west.internal (Postfix) with ESMTP id CAB523200258; Sun, 20 Feb 2022 22:42:40 -0500 (EST) Received: from mailfrontend2 ([10.202.2.163]) by compute2.internal (MEProxy); Sun, 20 Feb 2022 22:42:41 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:date:date:from:from:in-reply-to:message-id :mime-version:reply-to:sender:subject:subject:to:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; bh=4Ftth8 jIR9thK7FgELPaAjI8cJu47K8WHyuMsUo9B1g=; b=FdoiMWvU0BfcBuxRwZU+21 YkXa3ru8QvLBJzmL/AR2f3zSpdyN/RArycC556yS3nEpHXST4J6m2eSpv6RsAfae HVDZ0tHyCtBHkF+ERY5MvQNm5iP2mhYt2LyddO0yYU4fvStJbC0IIM14aXMD33Fd gDIUNKDMi398RCkvE7HHV8/5mkBXoCY3qYqSkxKuCmIYRhjFNNNGujLo6iCqohEo jrcLXcM12/4ynXvJxVvUm8dAIn1OnnbIzU1WSBn6s6cGnMvOO95hNqMNJKpHSPZj kYpA/hauWPYnxQm0ebleiBxI0kcS2gkEmB3L2nA0ujfpiws/nhx5TNz9yHNa5flQ == X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvvddrkeehgdeitdcutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpefhvffufffkofggtghogfesthekredtredtjeenucfhrhhomhepofgrrhgvkhcu ofgrrhgtiiihkhhofihskhhiqdfikphrvggtkhhiuceomhgrrhhmrghrvghksehinhhvih hsihgslhgvthhhihhnghhslhgrsgdrtghomheqnecuggftrfgrthhtvghrnhephefhfeet ueelvddvtedttdevieeluedtvedtfeejieelhedutdeuheduieejgfegnecuffhomhgrih hnpehkvghrnhgvlhdrohhrghenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhep mhgrihhlfhhrohhmpehmrghrmhgrrhgvkhesihhnvhhishhisghlvghthhhinhhgshhlrg gsrdgtohhm X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Sun, 20 Feb 2022 22:42:38 -0500 (EST) From: =?utf-8?q?Marek_Marczykowski-G=C3=B3recki?= To: linux-kernel@vger.kernel.org Cc: =?utf-8?q?Marek_Marczykowski-G=C3=B3recki?= , stable@vger.kernel.org, Michael Brown , Wei Liu , Paul Durrant , "David S. Miller" , Jakub Kicinski , xen-devel@lists.xenproject.org (moderated list:XEN NETWORK BACKEND DRIVER), netdev@vger.kernel.org (open list:XEN NETWORK BACKEND DRIVER) Subject: [PATCH 1/2] Revert "xen-netback: remove 'hotplug-status' once it has served its purpose" Date: Mon, 21 Feb 2022 04:42:12 +0100 Message-Id: <20220221034214.2237097-1-marmarek@invisiblethingslab.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Organization: Invisible Things Lab Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org This reverts commit 1f2565780e9b7218cf92c7630130e82dcc0fe9c2. The 'hotplug-status' node should not be removed as long as the vif device remains configured. Otherwise the xen-netback would wait for re-running the network script even if it was already called (in case of the frontent re-connecting). But also, it _should_ be removed when the vif device is destroyed (for example when unbinding the driver) - otherwise hotplug script would not configure the device whenever it re-appear. Moving removal of the 'hotplug-status' node was a workaround for nothing calling network script after xen-netback module is reloaded. But when vif interface is re-created (on xen-netback unbind/bind for example), the script should be called, regardless of who does that - currently this case is not handled by the toolstack, and requires manual script call. Keeping hotplug-status=connected to skip the call is wrong and leads to not configured interface. More discussion at https://lore.kernel.org/xen-devel/afedd7cb-a291-e773-8b0d-4db9b291fa98@ipxe.org/T/#u Cc: stable@vger.kernel.org Signed-off-by: Marek Marczykowski-Górecki Reported-by: kernel test robot --- Cc: Michael Brown --- drivers/net/xen-netback/xenbus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c index d24b7a7993aa..ce0f3035bee8 100644 --- a/drivers/net/xen-netback/xenbus.c +++ b/drivers/net/xen-netback/xenbus.c @@ -256,6 +256,7 @@ static void backend_disconnect(struct backend_info *be) unsigned int queue_index; xen_unregister_watchers(vif); + xenbus_rm(XBT_NIL, dev->nodename, "hotplug-status"); #ifdef CONFIG_DEBUG_FS xenvif_debugfs_delif(vif); #endif /* CONFIG_DEBUG_FS */ @@ -675,7 +676,6 @@ static void hotplug_status_changed(struct xenbus_watch *watch, /* Not interested in this watch anymore. */ unregister_hotplug_status_watch(be); - xenbus_rm(XBT_NIL, be->dev->nodename, "hotplug-status"); } kfree(str); }