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[209.51.188.17]) by mx.google.com with ESMTPS id m36si7395244qtb.162.2020.05.19.05.07.35 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 19 May 2020 05:07:35 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=b2QGYbkT; spf=pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:42668 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jb11z-0003M4-0a for alex.bennee@linaro.org; Tue, 19 May 2020 08:07:35 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49232) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jb11r-0003LQ-Kf for qemu-arm@nongnu.org; Tue, 19 May 2020 08:07:27 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:34932 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jb11q-0006ff-EC for qemu-arm@nongnu.org; Tue, 19 May 2020 08:07:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1589890045; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=1yixPAmz5zUZC7JmB18g9+vNTk7riD6tfYch1kgwzfk=; b=b2QGYbkT2vwm8lJxTI2V3vJ2xsgx16K5jaPqly1ZhPv5WvejVO3rxd47lpc4pnSxbbw2wD lY7fUZejvLo+eeOZ8riDN2gLQ3uq7S6r6OnPRqDHoO0D00W9mZYukRv7jeWe82UBguoflo AXIeIQLANVuFEFyziSslLCxHy/z13rg= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-452-iTOyIywwM4it_aaskxbC5w-1; Tue, 19 May 2020 08:07:21 -0400 X-MC-Unique: iTOyIywwM4it_aaskxbC5w-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AABA315C5C; Tue, 19 May 2020 12:07:14 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-112-32.ams2.redhat.com [10.36.112.32]) by smtp.corp.redhat.com (Postfix) with ESMTPS id BFE6752FB4; Tue, 19 May 2020 12:07:13 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id EC7FB11358BC; Tue, 19 May 2020 14:07:02 +0200 (CEST) From: Markus Armbruster To: Peter Maydell Subject: Re: [PATCH 02/24] display/xlnx_dp: Fix to realize "i2c-ddc" and "aux-to-i2c-bridge" References: <20200518050408.4579-1-armbru@redhat.com> <20200518050408.4579-3-armbru@redhat.com> <878sho7bor.fsf@dusky.pond.sub.org> Date: Tue, 19 May 2020 14:07:02 +0200 In-Reply-To: (Peter Maydell's message of "Tue, 19 May 2020 10:48:24 +0100") Message-ID: <87blmk2knt.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=205.139.110.61; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/18 23:19:13 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Daniel P. Berrange" , Eduardo Habkost , Alistair Francis , QEMU Developers , qemu-arm , Paolo Bonzini , Fred Konrad , KONRAD Frederic Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-arm" X-TUID: yDfuh1xf1tiV Peter Maydell writes: > On Tue, 19 May 2020 at 06:09, Markus Armbruster wrote: >> I figure the "device becomes real only on realize" thing is actually >> more myth than thing. > > It's not a myth, it's an API guarantee thing. If you don't realize > the device you create before you use it then you're in the world of > unspecified behaviour, and anything could happen: maybe it works, > maybe it doesn't, maybe it works today and breaks tomorrow. It's a myth in the sense "we want it to be that way, but it often ain't" :) Of course your right in that it is also a case of "use the interface the specified way, or else". 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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 578C7C433E0 for ; Tue, 19 May 2020 12:08:16 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2236320708 for ; Tue, 19 May 2020 12:08:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="b2QGYbkT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2236320708 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:43906 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jb12d-0003qr-B0 for qemu-devel@archiver.kernel.org; Tue, 19 May 2020 08:08:15 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49234) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jb11s-0003LY-7k for qemu-devel@nongnu.org; Tue, 19 May 2020 08:07:28 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:28140 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jb11q-0006fe-E7 for qemu-devel@nongnu.org; Tue, 19 May 2020 08:07:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1589890045; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=1yixPAmz5zUZC7JmB18g9+vNTk7riD6tfYch1kgwzfk=; b=b2QGYbkT2vwm8lJxTI2V3vJ2xsgx16K5jaPqly1ZhPv5WvejVO3rxd47lpc4pnSxbbw2wD lY7fUZejvLo+eeOZ8riDN2gLQ3uq7S6r6OnPRqDHoO0D00W9mZYukRv7jeWe82UBguoflo AXIeIQLANVuFEFyziSslLCxHy/z13rg= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-452-iTOyIywwM4it_aaskxbC5w-1; Tue, 19 May 2020 08:07:21 -0400 X-MC-Unique: iTOyIywwM4it_aaskxbC5w-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AABA315C5C; Tue, 19 May 2020 12:07:14 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-112-32.ams2.redhat.com [10.36.112.32]) by smtp.corp.redhat.com (Postfix) with ESMTPS id BFE6752FB4; Tue, 19 May 2020 12:07:13 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id EC7FB11358BC; Tue, 19 May 2020 14:07:02 +0200 (CEST) From: Markus Armbruster To: Peter Maydell Subject: Re: [PATCH 02/24] display/xlnx_dp: Fix to realize "i2c-ddc" and "aux-to-i2c-bridge" References: <20200518050408.4579-1-armbru@redhat.com> <20200518050408.4579-3-armbru@redhat.com> <878sho7bor.fsf@dusky.pond.sub.org> Date: Tue, 19 May 2020 14:07:02 +0200 In-Reply-To: (Peter Maydell's message of "Tue, 19 May 2020 10:48:24 +0100") Message-ID: <87blmk2knt.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=205.139.110.61; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/18 23:19:13 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Daniel P. Berrange" , Eduardo Habkost , Alistair Francis , QEMU Developers , qemu-arm , "Edgar E. Iglesias" , Paolo Bonzini , Fred Konrad , KONRAD Frederic Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Peter Maydell writes: > On Tue, 19 May 2020 at 06:09, Markus Armbruster wrote: >> I figure the "device becomes real only on realize" thing is actually >> more myth than thing. > > It's not a myth, it's an API guarantee thing. If you don't realize > the device you create before you use it then you're in the world of > unspecified behaviour, and anything could happen: maybe it works, > maybe it doesn't, maybe it works today and breaks tomorrow. It's a myth in the sense "we want it to be that way, but it often ain't" :) Of course your right in that it is also a case of "use the interface the specified way, or else".