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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 EB20EC4361B for ; Thu, 17 Dec 2020 15:11:41 +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 4A008235FD for ; Thu, 17 Dec 2020 15:11:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4A008235FD 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]:32894 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kpuwM-0004uY-OK for qemu-devel@archiver.kernel.org; Thu, 17 Dec 2020 10:11:38 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:34964) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kpumC-0004N9-Kr for qemu-devel@nongnu.org; Thu, 17 Dec 2020 10:01:09 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:53916) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kpum1-0007tO-Lq for qemu-devel@nongnu.org; Thu, 17 Dec 2020 10:01:08 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1608217255; 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=VK6nSYcyxlQ99/4gk2RQCa/LpwqjxsuqtL5MgNzEcLI=; b=PBQ/OmdzRH2didGMWldSe7cveQwfqyw7MmrvZztikvxgHIFliPPceI6lQGCY7ewuqaBBEg hSguRvC9/mFPYMT97HRJjARnh1hqsa25ht8YZsDis4pXoqvHfPMCp/9GyH3CmUUyK1FrID i23hdhBVJ4i+cWg07WuraJeP3ALmMFQ= 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-283-f2gNOmDuNaiJvpewevI7ug-1; Thu, 17 Dec 2020 10:00:53 -0500 X-MC-Unique: f2gNOmDuNaiJvpewevI7ug-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B8D54107ACF6; Thu, 17 Dec 2020 15:00:52 +0000 (UTC) Received: from localhost.localdomain (unknown [10.35.206.213]) by smtp.corp.redhat.com (Postfix) with ESMTP id 00EA55D9D5; Thu, 17 Dec 2020 15:00:50 +0000 (UTC) From: Maxim Levitsky To: qemu-devel@nongnu.org Subject: [PATCH 3/3] event_notifier: handle initialization failure better Date: Thu, 17 Dec 2020 17:00:40 +0200 Message-Id: <20201217150040.906961-4-mlevitsk@redhat.com> In-Reply-To: <20201217150040.906961-1-mlevitsk@redhat.com> References: <20201217150040.906961-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mlevitsk@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=216.205.24.124; envelope-from=mlevitsk@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: Fam Zheng , Paolo Bonzini , Maxim Levitsky , "Michael S. Tsirkin" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Add 'initialized' field and use it to avoid touching event notifiers which are either not initialized or if their initialization failed. This is somewhat a hack, but it seems the less intrusive way to make virtio code deal with event notifiers that failed initialization. Signed-off-by: Maxim Levitsky --- include/qemu/event_notifier.h | 1 + util/event_notifier-posix.c | 16 ++++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/include/qemu/event_notifier.h b/include/qemu/event_notifier.h index 3380b662f3..b79add035d 100644 --- a/include/qemu/event_notifier.h +++ b/include/qemu/event_notifier.h @@ -24,6 +24,7 @@ struct EventNotifier { #else int rfd; int wfd; + bool initialized; #endif }; diff --git a/util/event_notifier-posix.c b/util/event_notifier-posix.c index 00d93204f9..5b2110e861 100644 --- a/util/event_notifier-posix.c +++ b/util/event_notifier-posix.c @@ -29,6 +29,7 @@ void event_notifier_init_fd(EventNotifier *e, int fd) { e->rfd = fd; e->wfd = fd; + e->initialized = true; } #endif @@ -68,6 +69,7 @@ int event_notifier_init(EventNotifier *e, int active) if (active) { event_notifier_set(e); } + e->initialized = true; return 0; fail: @@ -78,12 +80,18 @@ fail: void event_notifier_cleanup(EventNotifier *e) { + if (!e->initialized) { + return; + } + if (e->rfd != e->wfd) { close(e->rfd); } + e->rfd = -1; close(e->wfd); e->wfd = -1; + e->initialized = false; } int event_notifier_get_fd(const EventNotifier *e) @@ -96,6 +104,10 @@ int event_notifier_set(EventNotifier *e) static const uint64_t value = 1; ssize_t ret; + if (!e->initialized) { + return -1; + } + do { ret = write(e->wfd, &value, sizeof(value)); } while (ret < 0 && errno == EINTR); @@ -113,6 +125,10 @@ int event_notifier_test_and_clear(EventNotifier *e) ssize_t len; char buffer[512]; + if (!e->initialized) { + return 0; + } + /* Drain the notify pipe. For eventfd, only 8 bytes will be read. */ value = 0; do { -- 2.26.2