From nobody Wed Nov 5 13:40:38 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1497252745559881.6665060577033; Mon, 12 Jun 2017 00:32:25 -0700 (PDT) Received: from localhost ([::1]:36479 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dKJpm-0005eK-Tj for importer@patchew.org; Mon, 12 Jun 2017 03:32:22 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42736) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dKJoo-0005N3-Qw for qemu-devel@nongnu.org; Mon, 12 Jun 2017 03:31:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dKJoj-00060Y-To for qemu-devel@nongnu.org; Mon, 12 Jun 2017 03:31:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39272) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dKJoj-00060I-Nw for qemu-devel@nongnu.org; Mon, 12 Jun 2017 03:31:17 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id C0AD95D68D for ; Mon, 12 Jun 2017 07:31:15 +0000 (UTC) Received: from nilsson.home.kraxel.org (ovpn-116-48.ams2.redhat.com [10.36.116.48]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8FA677ED7B; Mon, 12 Jun 2017 07:31:13 +0000 (UTC) Received: by nilsson.home.kraxel.org (Postfix, from userid 500) id 31A7F80D9D; Mon, 12 Jun 2017 09:31:11 +0200 (CEST) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com C0AD95D68D Authentication-Results: ext-mx10.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx10.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=kraxel@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com C0AD95D68D From: Gerd Hoffmann To: qemu-devel@nongnu.org Date: Mon, 12 Jun 2017 09:31:09 +0200 Message-Id: <20170612073109.25930-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Mon, 12 Jun 2017 07:31:15 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH] ehci: stop recursive calls to ehci_work_bh 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: Gerd Hoffmann Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Can happen with usb-storage devices: ehci_work_bh calls usb-storage, usb-storage calls into block layer, block layer may run BHs. Add a simple bool and just do nothing in case we figure ehci_work_bh is active. Signed-off-by: Gerd Hoffmann --- hw/usb/hcd-ehci.h | 1 + hw/usb/hcd-ehci.c | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/hw/usb/hcd-ehci.h b/hw/usb/hcd-ehci.h index 938d8aa284..821f1ded43 100644 --- a/hw/usb/hcd-ehci.h +++ b/hw/usb/hcd-ehci.h @@ -297,6 +297,7 @@ struct EHCIState { */ QEMUTimer *frame_timer; QEMUBH *async_bh; + bool working; uint32_t astate; /* Current state in asynchronous schedule */ uint32_t pstate; /* Current state in periodic schedule */ USBPort ports[NB_PORTS]; diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c index 17c572c55f..73090e01ad 100644 --- a/hw/usb/hcd-ehci.c +++ b/hw/usb/hcd-ehci.c @@ -2241,6 +2241,11 @@ static void ehci_work_bh(void *opaque) uint64_t uframes, skipped_uframes; int i; =20 + if (ehci->working) { + return; + } + ehci->working =3D true; + t_now =3D qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); ns_elapsed =3D t_now - ehci->last_run_ns; uframes =3D ns_elapsed / UFRAME_TIMER_NS; @@ -2322,6 +2327,8 @@ static void ehci_work_bh(void *opaque) } timer_mod(ehci->frame_timer, expire_time); } + + ehci->working =3D false; } =20 static void ehci_work_timer(void *opaque) --=20 2.9.3