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s=mimecast20190719; t=1709712909; 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: content-transfer-encoding:content-transfer-encoding; bh=mFpMS6WR8NVLm8NlkeXo2TxGNnD58mgHm1nye30iap4=; b=COHEBsS1SyX3xuMYP65KlFN/7lcF5BmhnKFGzbopiZw62lWAiPEgRFahi81st3t4SflFxV YdZPEEzwlcnm+GMfeHWkZkdXHspqsSuoXlOZfEGtjGXsplcTB1990Elix4roYnK4m8UHhg zp7gZt6NDhcgaolH6YuUTvpMujP879Q= X-MC-Unique: QMYgzSKWMhuLr_1Q0KX0eA-1 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-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.3 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1709712940602100001 Content-Type: text/plain; charset="utf-8" Both $ qemu-system-x86_64 -chardev null,id=3Dchr0,mux=3Don -mon chardev=3Dch= r0 -mon chardev=3Dchr0 -mon chardev=3Dchr0 -mon chardev=3Dchr0 -mon chardev= =3Dchr0 and $ qemu-system-x86_64 -chardev null,id=3Dchr0 -mon chardev=3Dchr0 -mon c= hardev=3Dchr0 fail with qemu-system-x86_64: -mon chardev=3Dchr0: Device 'chr0' is in use Improve to qemu-system-x86_64: -mon chardev=3Dchr0: too many uses of multiplexed c= hardev 'chr0' (maximum is 4) and qemu-system-x86_64: -mon chardev=3Dchr0: chardev 'chr0' is already in u= se Signed-off-by: Markus Armbruster Reviewed-by: Marc-Andr=C3=A9 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, Err= or **errp) MuxChardev *d =3D MUX_CHARDEV(s); =20 if (d->mux_cnt >=3D MAX_MUX) { - goto unavailable; + error_setg(errp, + "too many uses of multiplexed chardev '%s'" + " (maximum is " stringify(MAX_MUX) ")", + s->label); + return false; } =20 d->backends[d->mux_cnt] =3D b; tag =3D 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 =3D b; } @@ -215,10 +220,6 @@ bool qemu_chr_fe_init(CharBackend *b, Chardev *s, Erro= r **errp) b->tag =3D tag; b->chr =3D s; return true; - -unavailable: - error_setg(errp, QERR_DEVICE_IN_USE, s->label); - return false; } =20 void qemu_chr_fe_deinit(CharBackend *b, bool del) --=20 2.44.0