From patchwork Wed Aug 15 03:12:35 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fam Zheng X-Patchwork-Id: 957779 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 41qvsR0YRsz9ryt for ; Wed, 15 Aug 2018 13:22:19 +1000 (AEST) Received: from localhost ([::1]:47121 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fpmO0-00050V-PI for incoming@patchwork.ozlabs.org; Tue, 14 Aug 2018 23:22:16 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56902) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fpmFB-00070S-5u for qemu-devel@nongnu.org; Tue, 14 Aug 2018 23:13:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fpmF7-0000qZ-JK for qemu-devel@nongnu.org; Tue, 14 Aug 2018 23:13:08 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:35706 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fpmF7-0000pI-Ax for qemu-devel@nongnu.org; Tue, 14 Aug 2018 23:13:05 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0243E4012983; Wed, 15 Aug 2018 03:13:05 +0000 (UTC) Received: from lemon.usersys.redhat.com (ovpn-12-85.pek2.redhat.com [10.72.12.85]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8EB097C5E; Wed, 15 Aug 2018 03:13:03 +0000 (UTC) From: Fam Zheng To: qemu-devel@nongnu.org Date: Wed, 15 Aug 2018 11:12:35 +0800 Message-Id: <20180815031248.14908-5-famz@redhat.com> In-Reply-To: <20180815031248.14908-1-famz@redhat.com> References: <20180815031248.14908-1-famz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Wed, 15 Aug 2018 03:13:05 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Wed, 15 Aug 2018 03:13:05 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'famz@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PULL 04/17] nvme: simplify plug/unplug X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Paolo Bonzini bdrv_io_plug/bdrv_io_unplug take care of keeping a nesting count, so change s->plugged to just a bool. Signed-off-by: Paolo Bonzini Message-Id: <20180813144320.12382-2-pbonzini@redhat.com> Signed-off-by: Fam Zheng --- block/nvme.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/block/nvme.c b/block/nvme.c index 37805e8890..781d77d6d2 100644 --- a/block/nvme.c +++ b/block/nvme.c @@ -104,7 +104,7 @@ typedef struct { uint64_t nsze; /* Namespace size reported by identify command */ int nsid; /* The namespace id to read/write data. */ uint64_t max_transfer; - int plugged; + bool plugged; CoMutex dma_map_lock; CoQueue dma_flush_queue; @@ -1101,7 +1101,8 @@ static void nvme_attach_aio_context(BlockDriverState *bs, static void nvme_aio_plug(BlockDriverState *bs) { BDRVNVMeState *s = bs->opaque; - s->plugged++; + assert(!s->plugged); + s->plugged = true; } static void nvme_aio_unplug(BlockDriverState *bs) @@ -1109,14 +1110,13 @@ static void nvme_aio_unplug(BlockDriverState *bs) int i; BDRVNVMeState *s = bs->opaque; assert(s->plugged); - if (!--s->plugged) { - for (i = 1; i < s->nr_queues; i++) { - NVMeQueuePair *q = s->queues[i]; - qemu_mutex_lock(&q->lock); - nvme_kick(s, q); - nvme_process_completion(s, q); - qemu_mutex_unlock(&q->lock); - } + s->plugged = false; + for (i = 1; i < s->nr_queues; i++) { + NVMeQueuePair *q = s->queues[i]; + qemu_mutex_lock(&q->lock); + nvme_kick(s, q); + nvme_process_completion(s, q); + qemu_mutex_unlock(&q->lock); } }