From patchwork Wed Mar 6 08:15:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 13583477 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id A2905C54E41 for ; Wed, 6 Mar 2024 08:15:39 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rhmQs-000762-Pn; Wed, 06 Mar 2024 03:15:22 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rhmQm-00075S-16 for qemu-devel@nongnu.org; Wed, 06 Mar 2024 03:15:16 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rhmQg-0008Gn-Uf for qemu-devel@nongnu.org; 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Wed, 6 Mar 2024 08:15:07 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.39.192.3]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 00049112131D; Wed, 6 Mar 2024 08:15:06 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id D6BB721E6A24; Wed, 6 Mar 2024 09:15:05 +0100 (CET) From: Markus Armbruster To: qemu-devel@nongnu.org Cc: marcandre.lureau@redhat.com, pbonzini@redhat.com, qemu-trivial@nongnu.org Subject: [PATCH] char: Slightly better error reporting when chardev is in use Date: Wed, 6 Mar 2024 09:15:05 +0100 Message-ID: <20240306081505.2258405-1-armbru@redhat.com> MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.3 Received-SPF: pass client-ip=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Both $ qemu-system-x86_64 -chardev null,id=chr0,mux=on -mon chardev=chr0 -mon chardev=chr0 -mon chardev=chr0 -mon chardev=chr0 -mon chardev=chr0 and $ qemu-system-x86_64 -chardev null,id=chr0 -mon chardev=chr0 -mon chardev=chr0 fail with qemu-system-x86_64: -mon chardev=chr0: Device 'chr0' is in use Improve to qemu-system-x86_64: -mon chardev=chr0: too many uses of multiplexed chardev 'chr0' (maximum is 4) and qemu-system-x86_64: -mon chardev=chr0: chardev 'chr0' is already in use Signed-off-by: Markus Armbruster Reviewed-by: Marc-André Lureau --- chardev/char-fe.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/chardev/char-fe.c b/chardev/char-fe.c index 20222a4cad..66cee8475a 100644 --- a/chardev/char-fe.c +++ b/chardev/char-fe.c @@ -199,13 +199,18 @@ bool qemu_chr_fe_init(CharBackend *b, Chardev *s, Error **errp) MuxChardev *d = MUX_CHARDEV(s); if (d->mux_cnt >= MAX_MUX) { - goto unavailable; + error_setg(errp, + "too many uses of multiplexed chardev '%s'" + " (maximum is " stringify(MAX_MUX) ")", + s->label); + return false; } d->backends[d->mux_cnt] = b; tag = d->mux_cnt++; } else if (s->be) { - goto unavailable; + error_setg(errp, "chardev '%s' is already in use", s->label); + return false; } else { s->be = b; } @@ -215,10 +220,6 @@ bool qemu_chr_fe_init(CharBackend *b, Chardev *s, Error **errp) b->tag = tag; b->chr = s; return true; - -unavailable: - error_setg(errp, QERR_DEVICE_IN_USE, s->label); - return false; } void qemu_chr_fe_deinit(CharBackend *b, bool del)