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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 8E3C7C3A5A6 for ; Thu, 19 Sep 2019 22:36:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5761D208C0 for ; Thu, 19 Sep 2019 22:36:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568932576; bh=A96tY/4sS9HYUt1WTbvdvzg4QevFECvNRTBIpnu+yPA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2m1Zcn8vN/skOCcuA9lsESgfU9uM2f2LA39O5vvyjID/sjgrACBgvvff1llimUwUq nZB3UF8xdkOoZfnrDKzhlnH8oNdWNpd2lGxZrLxgEOPW97Qt4vJbUgtBc3rp6J3m6Z 05XVenE8uq1gglxiWtEtS9ML0C3KYiaDG0hkU0Qk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392401AbfISWgP (ORCPT ); Thu, 19 Sep 2019 18:36:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:44234 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404008AbfISWGo (ORCPT ); Thu, 19 Sep 2019 18:06:44 -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 DEFB721907; Thu, 19 Sep 2019 22:06:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1568930803; bh=A96tY/4sS9HYUt1WTbvdvzg4QevFECvNRTBIpnu+yPA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B7y2YE4aSgnVM5o4q5zkqVixKPpxHsEJIjxwq+r003UgHcqZ82MF8ljbhZNfaE/4t 8EORPLnHEcvYo2IdOfASscn+a/av9jdzihGSDjE9jrfcXhgwVX6nw+xGlaEmrqlMSx fXbRC9npwvX+e7voLVyTGUAalXu0agu2edtnrsvs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrew Lunn , "David S. Miller" Subject: [PATCH 5.2 020/124] net: dsa: Fix load order between DSA drivers and taggers Date: Fri, 20 Sep 2019 00:01:48 +0200 Message-Id: <20190919214819.826331215@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190919214819.198419517@linuxfoundation.org> References: <20190919214819.198419517@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Andrew Lunn [ Upstream commit 23426a25e55a417dc104df08781b6eff95e65f3f ] The DSA core, DSA taggers and DSA drivers all make use of module_init(). Hence they get initialised at device_initcall() time. The ordering is non-deterministic. It can be a DSA driver is bound to a device before the needed tag driver has been initialised, resulting in the message: No tagger for this switch Rather than have this be fatal, return -EPROBE_DEFER so that it is tried again later once all the needed drivers have been loaded. Fixes: d3b8c04988ca ("dsa: Add boilerplate helper to register DSA tag driver modules") Signed-off-by: Andrew Lunn Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/dsa/dsa2.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/dsa/dsa2.c +++ b/net/dsa/dsa2.c @@ -577,6 +577,8 @@ static int dsa_port_parse_cpu(struct dsa tag_protocol = ds->ops->get_tag_protocol(ds, dp->index); tag_ops = dsa_tag_driver_get(tag_protocol); if (IS_ERR(tag_ops)) { + if (PTR_ERR(tag_ops) == -ENOPROTOOPT) + return -EPROBE_DEFER; dev_warn(ds->dev, "No tagger for this switch\n"); return PTR_ERR(tag_ops); }