From patchwork Tue Oct 15 08:51:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= X-Patchwork-Id: 13835880 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 AE167CFC276 for ; Tue, 15 Oct 2024 08:52:51 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t0dI0-00072o-Ml; Tue, 15 Oct 2024 04:52:24 -0400 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 1t0dHx-000723-EF for qemu-devel@nongnu.org; Tue, 15 Oct 2024 04:52:21 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t0dHu-00088v-O5 for qemu-devel@nongnu.org; Tue, 15 Oct 2024 04:52:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1728982324; 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: in-reply-to:in-reply-to:references:references; bh=HxcQJk8yN2sQugipUZHtSXsGTe+akfuemPRXmMCv6rI=; b=fmAhoJzQ5BHtVm6GE53bsvmLlrL6q6jdimYyVFQWVagPp0eLyn+mFvey1wZYOatR7Uosc8 NtOe2B2Z4wHvrjbw+2qSMWlXGG01CfhyAPCbSEAWcDxpJ8iJa5IW+W+Ii3ryF2Q9Spfx1v klsmcaBOuhE8rxR5UyiFpWnopkJDeFo= Received: from mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-656-vTNfh-LfOYaHXNqaY0_07g-1; Tue, 15 Oct 2024 04:52:00 -0400 X-MC-Unique: vTNfh-LfOYaHXNqaY0_07g-1 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id C1F8C19560BF; Tue, 15 Oct 2024 08:51:59 +0000 (UTC) Received: from localhost (unknown [10.39.208.15]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id CC1CD19560A2; Tue, 15 Oct 2024 08:51:58 +0000 (UTC) From: marcandre.lureau@redhat.com To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, Roman Penyaev , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini Subject: [PULL 1/8] chardev/char: fix qemu_chr_is_busy() check Date: Tue, 15 Oct 2024 12:51:43 +0400 Message-ID: <20241015085150.219486-2-marcandre.lureau@redhat.com> In-Reply-To: <20241015085150.219486-1-marcandre.lureau@redhat.com> References: <20241015085150.219486-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.133.124; envelope-from=marcandre.lureau@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.076, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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 From: Roman Penyaev `mux_cnt` struct member never goes negative or decrements, so mux chardev can be !busy only when there are no frontends attached. This patch fixes the always-true check. Fixes: a4afa548fc6d ("char: move front end handlers in CharBackend") Signed-off-by: Roman Penyaev Cc: "Marc-André Lureau" Cc: qemu-devel@nongnu.org Reviewed-by: Marc-André Lureau Message-ID: <20241014152408.427700-2-r.peniaev@gmail.com> --- chardev/char.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/chardev/char.c b/chardev/char.c index c0cc52824b..f54dc3a862 100644 --- a/chardev/char.c +++ b/chardev/char.c @@ -333,7 +333,7 @@ static bool qemu_chr_is_busy(Chardev *s) { if (CHARDEV_IS_MUX(s)) { MuxChardev *d = MUX_CHARDEV(s); - return d->mux_cnt >= 0; + return d->mux_cnt > 0; } else { return s->be != NULL; }