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Wed, 11 Sep 2019 23:38:22 +0000 From: Dexuan Cui To: KY Srinivasan , Haiyang Zhang , Stephen Hemminger , "sashal@kernel.org" , "lorenzo.pieralisi@arm.com" , "bhelgaas@google.com" , "linux-hyperv@vger.kernel.org" , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Michael Kelley CC: Dexuan Cui Subject: [PATCH 3/4] PCI: hv: Do not queue new work items on hibernation Thread-Topic: [PATCH 3/4] PCI: hv: Do not queue new work items on hibernation Thread-Index: AQHVaPn/cNR9IJtpNE6TYmXuPOiYYQ== Date: Wed, 11 Sep 2019 23:38:21 +0000 Message-ID: <1568245086-70601-4-git-send-email-decui@microsoft.com> References: <1568245086-70601-1-git-send-email-decui@microsoft.com> In-Reply-To: <1568245086-70601-1-git-send-email-decui@microsoft.com> Reply-To: Dexuan Cui Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR19CA0072.namprd19.prod.outlook.com (2603:10b6:300:94::34) To SN6PR2101MB0942.namprd21.prod.outlook.com (2603:10b6:805:4::19) authentication-results: spf=none (sender IP is ) smtp.mailfrom=decui@microsoft.com; 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DIR:OUT; SFP:1102; SCL:1; SRVR:SN6PR2101MB1087; H:SN6PR2101MB0942.namprd21.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: QBXfQXg4zjNvIilfHYTnCyBEftJhpenT+zazlYDQ40yq03UzBImzHs7Xuulri69DsQCmynzITeHD77yoAd7fa3cMq2U9LYIJHfYxvTaq3/0FADhKx4AKtFYGEHxFaOtLyWsnanDAr5Q1cJz1iSWDnihRl+J7nwleFVik+5ByDP5/a9xAjQRmSJj1SWbSm94JI8vd1+5qDfZevd6crsZF5UYJ+NdXJ6Jmm7iPQPxWDF6HrwkbDnVsYmZnaXX7KidhZ+TNLcGEEJZsRPONzMAIYVrOaSZqM8U38xhYFgVMnYujoscipfpzNW/FWXMiaSmSICkkmZeQ3VpD8XHCWYPqLtfabmjbnJmRShJvtxOD980kMcs+JK6h+WEqfWl8WX025YrbYZlbA3UODd5uTWq3+PGF3TYA3ZprALJkSbJHdHo= MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: cd5d5c12-31ae-4993-51f2-08d737112181 X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Sep 2019 23:38:21.9075 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: u/6Wts2uDJRFdziV2cCVrDMvQ3CLOvijdWUYeuUexpgIq4O/C7QC3V9E7FcYnGsfYeJ7hTkeTY7ocL72VA6ITg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR2101MB1087 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org We must make sure there is no pending work items before we call vmbus_close(). Signed-off-by: Dexuan Cui --- drivers/pci/controller/pci-hyperv.c | 33 ++++++++++++++++++++++++++++++--- 1 file changed, 30 insertions(+), 3 deletions(-) diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index 3b77a3a..2655df2 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -422,6 +422,7 @@ enum hv_pcibus_state { hv_pcibus_init = 0, hv_pcibus_probed, hv_pcibus_installed, + hv_pcibus_removing, hv_pcibus_removed, hv_pcibus_maximum }; @@ -1841,6 +1842,12 @@ static void hv_pci_devices_present(struct hv_pcibus_device *hbus, unsigned long flags; bool pending_dr; + if (hbus->state == hv_pcibus_removing) { + dev_info(&hbus->hdev->device, + "PCI VMBus BUS_RELATIONS: ignored\n"); + return; + } + dr_wrk = kzalloc(sizeof(*dr_wrk), GFP_NOWAIT); if (!dr_wrk) return; @@ -1957,11 +1964,19 @@ static void hv_eject_device_work(struct work_struct *work) */ static void hv_pci_eject_device(struct hv_pci_dev *hpdev) { + struct hv_pcibus_device *hbus = hpdev->hbus; + struct hv_device *hdev = hbus->hdev; + + if (hbus->state == hv_pcibus_removing) { + dev_info(&hdev->device, "PCI VMBus EJECT: ignored\n"); + return; + } + hpdev->state = hv_pcichild_ejecting; get_pcichild(hpdev); INIT_WORK(&hpdev->wrk, hv_eject_device_work); - get_hvpcibus(hpdev->hbus); - queue_work(hpdev->hbus->wq, &hpdev->wrk); + get_hvpcibus(hbus); + queue_work(hbus->wq, &hpdev->wrk); } /** @@ -2757,9 +2772,21 @@ static int hv_pci_remove(struct hv_device *hdev) static int hv_pci_suspend(struct hv_device *hdev) { struct hv_pcibus_device *hbus = hv_get_drvdata(hdev); + enum hv_pcibus_state old_state; int ret; - /* XXX: Need to prevent any new work from being queued. */ + tasklet_disable(&hdev->channel->callback_event); + + /* Change the hbus state to prevent new work items. */ + old_state = hbus->state; + if (hbus->state == hv_pcibus_installed) + hbus->state = hv_pcibus_removing; + + tasklet_enable(&hdev->channel->callback_event); + + if (old_state != hv_pcibus_installed) + return -EINVAL; + flush_workqueue(hbus->wq); ret = hv_pci_bus_exit(hdev, true);