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 41401C25B6C for ; Tue, 24 Oct 2023 13:37:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234753AbjJXNhR (ORCPT ); Tue, 24 Oct 2023 09:37:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44694 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234576AbjJXNhA (ORCPT ); Tue, 24 Oct 2023 09:37:00 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BAD2A6E9A for ; Tue, 24 Oct 2023 06:29:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=C+6ngxXiQEDkXVyuFYGYuszR6TVOiYUWavWAJVtm/AU=; b=qeYg9IC9nGbAPP4+9ZVW0DcneT dPLomUbBTFQcRiFyAeny3eDZwsgi5Sg03yiTI1kEmEd/8xEWRYr/CX+BOAcfs8rfRAz/sxDCbWO9v VU/mPtuyqDGq56WUUtmjGsXc+B2WUJWp4E56JH2vz9RVFVCT6oORuwVruvt9nW3Drj7Lu/1/9/+yz yKQPhQzgWj+IKWv/H0f1hWF9nt5gALuA/Ap80CDrDwkV0jbd6Xb4XbgRDtpK/XEbPIatKnU0h0zF/ z7o3H7+Bkyom1b4QILTFxJAaEdg54FbO6ccxRf3pMQhi8vHYWYCBCBHNtAy0gt4wV3fWblw0g1xHt eM42HD6A==; Received: from [2001:8b0:10b:5:758e:a1c4:bc7:e7a7] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qvHSx-002iFr-GR; Tue, 24 Oct 2023 13:29:03 +0000 Message-ID: <4d059cb96a92004fe25fdb140a6c0b12e91b4d7e.camel@infradead.org> Subject: Re: [PATCH 06/12] hw/xen: add get_frontend_path() method to XenDeviceClass From: David Woodhouse To: paul@xen.org, qemu-devel@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Stefano Stabellini , Anthony Perard , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , Paolo Bonzini , "Michael S. Tsirkin" , Marcel Apfelbaum , Richard Henderson , Eduardo Habkost , Marcelo Tosatti , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org Date: Tue, 24 Oct 2023 14:29:02 +0100 In-Reply-To: <55bb6967-9499-45ef-b4c8-00fbfaccef0d@xen.org> References: <20231016151909.22133-1-dwmw2@infradead.org> <20231016151909.22133-7-dwmw2@infradead.org> <5ef43a7c-e535-496d-8a14-bccbadab3bc0@xen.org> <55bb6967-9499-45ef-b4c8-00fbfaccef0d@xen.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-KP14IPV3DVhrYbYuEmat" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org --=-KP14IPV3DVhrYbYuEmat Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-10-24 at 13:59 +0100, Paul Durrant wrote: > On 24/10/2023 13:56, David Woodhouse wrote: > > On Tue, 2023-10-24 at 13:42 +0100, Paul Durrant wrote: > > >=20 > > > > --- a/hw/xen/xen-bus.c > > > > +++ b/hw/xen/xen-bus.c > > > > @@ -711,8 +711,16 @@ static void xen_device_frontend_create(XenDevi= ce *xendev, Error **errp) > > > > =C2=A0=C2=A0=C2=A0 { > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ERRP_GUARD(); > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 XenBus *xenbus =3D XEN_B= US(qdev_get_parent_bus(DEVICE(xendev))); > > > > +=C2=A0=C2=A0=C2=A0 XenDeviceClass *xendev_class =3D XEN_DEVICE_GET= _CLASS(xendev); > > > > =C2=A0=C2=A0=C2=A0=20 > > > > -=C2=A0=C2=A0=C2=A0 xendev->frontend_path =3D xen_device_get_fronte= nd_path(xendev); > > > > +=C2=A0=C2=A0=C2=A0 if (xendev_class->get_frontend_path) { > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 xendev->frontend_path = =3D xendev_class->get_frontend_path(xendev, errp); > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (!xendev->frontend_p= ath) { > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= return; > > >=20 > > > I think you need to update errp here to note that you are failing to > > > create the frontend. > >=20 > > If xendev_class->get_frontend_path returned NULL it will have filled in= errp. > >=20 >=20 > Ok, but a prepend to say that a lack of path there means we skip=20 > frontend creation seems reasonable? No, it *is* returning an error. Perhaps I can make it if (!xendev->frontend_path) { /* * If the ->get_frontend_path() method returned NULL, it will * already have set *errp accordingly. Return the error. */ return /* false */; } > > As a general rule (I'll be doing a bombing run on xen-bus once I get my > > patch queue down into single digits) we should never check 'if (*errp)' > > to check if a function had an error. It should *also* return a success > > or failure indication, and we should cope with errp being NULL. > >=20 >=20 > I'm pretty sure someone told me the exact opposite a few years back. 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