From patchwork Fri May 7 15:12:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Giuseppe Esposito X-Patchwork-Id: 1475576 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=VjZNTyPF; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4FcDXR1WHxz9sW7 for ; Sat, 8 May 2021 01:15:19 +1000 (AEST) Received: from localhost ([::1]:42130 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lf2CD-0001h5-3b for incoming@patchwork.ozlabs.org; Fri, 07 May 2021 11:15:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45914) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lf29M-0007D1-QY for qemu-devel@nongnu.org; Fri, 07 May 2021 11:12:20 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:54532) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lf29L-0001rc-25 for qemu-devel@nongnu.org; Fri, 07 May 2021 11:12:20 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1620400338; 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=bPJI0wpYCTY0iQNa0rAI5UCS3nrZccZucaPyLMiMpFw=; b=VjZNTyPFrgep6kCsxbiQjJG0+hdCxj8TGbCE8P4KWwH21TEYKpo+4KLf8bx2V+Jsk7n5x5 2HceWhF3fgJLmSkpcM/EXQsxIMlYeHjH+GWTh9ASfmoCJ9E7bPIKnpPD+GsLfHvZqjQ2bz PW6HBtyMnrq/c5jnCAbSQSQPs3EBbvk= 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-338-ZIfZC44-OCmNNaFTG3PF5g-1; Fri, 07 May 2021 11:12:15 -0400 X-MC-Unique: ZIfZC44-OCmNNaFTG3PF5g-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 B0262107ACCA; Fri, 7 May 2021 15:12:14 +0000 (UTC) Received: from localhost.localdomain (ovpn-113-137.ams2.redhat.com [10.36.113.137]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2F0425D9CC; Fri, 7 May 2021 15:12:12 +0000 (UTC) From: Emanuele Giuseppe Esposito To: qemu-block@nongnu.org Subject: [PATCH v2 4/5] blkdebug: do not suspend in the middle of QLIST_FOREACH_SAFE Date: Fri, 7 May 2021 17:12:02 +0200 Message-Id: <20210507151203.39643-5-eesposit@redhat.com> In-Reply-To: <20210507151203.39643-1-eesposit@redhat.com> References: <20210507151203.39643-1-eesposit@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=eesposit@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=eesposit@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.699, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=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: Kevin Wolf , Paolo Bonzini , Emanuele Giuseppe Esposito , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" That would be unsafe in case a rule other than the current one is removed while the coroutine has yielded. Keep FOREACH_SAFE because suspend_request deletes the current rule. After this patch, *all* matching rules are deleted before suspending the coroutine, rather than just one. This doesn't affect the existing testcases. Use actions_count to see how many yeld to issue. Co-developed-by: Paolo Bonzini Signed-off-by: Emanuele Giuseppe Esposito --- block/blkdebug.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/block/blkdebug.c b/block/blkdebug.c index 388b5ed615..dffd869b32 100644 --- a/block/blkdebug.c +++ b/block/blkdebug.c @@ -789,7 +789,6 @@ static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule) if (!qtest_enabled()) { printf("blkdebug: Suspended request '%s'\n", r->tag); } - qemu_coroutine_yield(); } static void process_rule(BlockDriverState *bs, struct BlkdebugRule *rule, @@ -834,6 +833,12 @@ static void blkdebug_debug_event(BlockDriverState *bs, BlkdebugEvent event) QLIST_FOREACH_SAFE(rule, &s->rules[event], next, next) { process_rule(bs, rule, actions_count); } + + while (actions_count[ACTION_SUSPEND] > 0) { + qemu_coroutine_yield(); + actions_count[ACTION_SUSPEND]--; + } + s->state = s->new_state; }