From patchwork Tue Oct 6 12:39:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 303600 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=-9.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 78568C4363D for ; Tue, 6 Oct 2020 12:58:19 +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 E35942075A for ; Tue, 6 Oct 2020 12:58:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="RDQ3nuKK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E35942075A 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]:36410 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kPmXp-0005Mm-P3 for qemu-devel@archiver.kernel.org; Tue, 06 Oct 2020 08:58:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56366) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kPmGd-0002EQ-J9 for qemu-devel@nongnu.org; Tue, 06 Oct 2020 08:40:31 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:30750) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kPmGb-00080w-55 for qemu-devel@nongnu.org; Tue, 06 Oct 2020 08:40:31 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1601988028; 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=5LCE8BFoYRDbMZRp/QGyqUoACL7bTwS92nRXSyf7F1o=; b=RDQ3nuKKnO7NZnDGZkXx1RdI1LHejrmAqn/UH350yXfu7CM8AlTXYp+yeuF2ngD3St525R GWcZuwH87WWtwq64EHHVwir3FatPUKElwerk+vUnBJOa+3IpVjksrcsP6RtTZsVqWZuUWL +2B1S2TpMIs3ggU5/eOoW2vQvcJf250= 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-265-Yw9QaetrM2SJuJUpbrUXMw-1; Tue, 06 Oct 2020 08:40:25 -0400 X-MC-Unique: Yw9QaetrM2SJuJUpbrUXMw-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 70A881084D8B; Tue, 6 Oct 2020 12:40:24 +0000 (UTC) Received: from localhost.localdomain (unknown [10.35.206.84]) by smtp.corp.redhat.com (Postfix) with ESMTP id 54E0955760; Tue, 6 Oct 2020 12:40:17 +0000 (UTC) From: Maxim Levitsky To: qemu-devel@nongnu.org Subject: [PATCH v7 12/13] virtio-scsi: use scsi_device_get Date: Tue, 6 Oct 2020 15:39:03 +0300 Message-Id: <20201006123904.610658-13-mlevitsk@redhat.com> In-Reply-To: <20201006123904.610658-1-mlevitsk@redhat.com> References: <20201006123904.610658-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 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 Received-SPF: pass client-ip=216.205.24.124; envelope-from=mlevitsk@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/06 00:55:20 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.733, 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_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: Fam Zheng , Laurent Vivier , Thomas Huth , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Eduardo Habkost , qemu-block@nongnu.org, "Michael S. Tsirkin" , Stefan Hajnoczi , Jason Wang , Markus Armbruster , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Stefan Hajnoczi , Paolo Bonzini , Maxim Levitsky , John Snow , Stefan Berger Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This will help us to avoid the scsi device disappearing after we took a reference to it. It doesn't by itself forbid case when we try to access an unrealized device Suggested-by: Stefan Hajnoczi Signed-off-by: Maxim Levitsky Reviewed-by: Stefan Hajnoczi Message-Id: <20200913160259.32145-9-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini --- hw/scsi/virtio-scsi.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c index 971afbb217..3db9a8aae9 100644 --- a/hw/scsi/virtio-scsi.c +++ b/hw/scsi/virtio-scsi.c @@ -33,7 +33,7 @@ static inline int virtio_scsi_get_lun(uint8_t *lun) return ((lun[2] << 8) | lun[3]) & 0x3FFF; } -static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun) +static inline SCSIDevice *virtio_scsi_device_get(VirtIOSCSI *s, uint8_t *lun) { if (lun[0] != 1) { return NULL; @@ -41,7 +41,7 @@ static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun) if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) { return NULL; } - return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); + return scsi_device_get(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); } void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req) @@ -256,7 +256,7 @@ static inline void virtio_scsi_ctx_check(VirtIOSCSI *s, SCSIDevice *d) * case of async cancellation. */ static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) { - SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf.lun); + SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun); SCSIRequest *r, *next; BusChild *kid; int target; @@ -370,10 +370,10 @@ static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) rcu_read_lock(); QTAILQ_FOREACH_RCU(kid, &s->bus.qbus.children, sibling) { - d = SCSI_DEVICE(kid->child); - if (d->channel == 0 && d->id == target) { - qdev_reset_all(&d->qdev); - } + SCSIDevice *d1 = SCSI_DEVICE(kid->child); + if (d1->channel == 0 && d1->id == target) { + qdev_reset_all(&d1->qdev); + } } rcu_read_unlock(); @@ -386,14 +386,17 @@ static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) break; } + object_unref(OBJECT(d)); return ret; incorrect_lun: req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN; + object_unref(OBJECT(d)); return ret; fail: req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET; + object_unref(OBJECT(d)); return ret; } @@ -564,7 +567,7 @@ static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req) } } - d = virtio_scsi_device_find(s, req->req.cmd.lun); + d = virtio_scsi_device_get(s, req->req.cmd.lun); if (!d) { req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET; virtio_scsi_complete_cmd_req(req); @@ -580,10 +583,12 @@ static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req) req->sreq->cmd.xfer > req->qsgl.size)) { req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN; virtio_scsi_complete_cmd_req(req); + object_unref(OBJECT(d)); return -ENOBUFS; } scsi_req_ref(req->sreq); blk_io_plug(d->conf.blk); + object_unref(OBJECT(d)); return 0; }