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Mon, 4 Mar 2019 21:34:49 +0000 Received: from MN2PR21MB1296.namprd21.prod.outlook.com ([fe80::8d7a:2ffa:8916:69c3]) by MN2PR21MB1296.namprd21.prod.outlook.com ([fe80::8d7a:2ffa:8916:69c3%3]) with mapi id 15.20.1709.002; Mon, 4 Mar 2019 21:34:49 +0000 From: Dexuan Cui To: "lorenzo.pieralisi@arm.com" , "bhelgaas@google.com" , "linux-pci@vger.kernel.org" , KY Srinivasan , Stephen Hemminger , Michael Kelley , Sasha Levin CC: "linux-hyperv@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "driverdev-devel@linuxdriverproject.org" , Haiyang Zhang , "olaf@aepfle.de" , "apw@canonical.com" , "jasowang@redhat.com" , vkuznets , "marcelo.cerri@canonical.com" , "jackm@mellanox.com" , Dexuan Cui , "stable@vger.kernel.org" Subject: [PATCH 2/3] PCI: hv: Add hv_pci_remove_slots() when we unload the driver Thread-Topic: [PATCH 2/3] PCI: hv: Add hv_pci_remove_slots() when we unload the driver Thread-Index: AQHU0tIYYM00GlnBAUeAnbzMfj5zdw== Date: Mon, 4 Mar 2019 21:34:48 +0000 Message-ID: <20190304213357.16652-3-decui@microsoft.com> References: <20190304213357.16652-1-decui@microsoft.com> In-Reply-To: <20190304213357.16652-1-decui@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BN6PR11CA0010.namprd11.prod.outlook.com (2603:10b6:405:2::20) To MN2PR21MB1296.namprd21.prod.outlook.com (2603:10b6:208:3e::26) x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.19.1 x-originating-ip: [107.180.71.197] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 9ab0dda4-ce2a-40ec-6f9d-08d6a0e93a5b x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600127)(711020)(4605104)(4618075)(2017052603328)(7193020);SRVR:MN2PR21MB1183; 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x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: ywYzU7CyfTFriQQs9sNaGiPOzyPI3usV8PhR7nNQRNWcRv6iCsTXja4FSkwrtv8aRG7tQyUrf0vsgm5MKqXmUsqam4mMbnqUaBQcZYYVmLCHW59Z1lnNCVbqVTnCcU/XDWUnVyoMZ/CwicG1TI9W0OB0jgAMirxXioEIyUtiz3C+Yoe5QhNt1EVxeZbERyvf4/O9FwGUSQBjiw/TBe1VlBZxXSUL5IcaWrulkfjy4Ubo4lFfuStYsVNkQWdsN1eTF+7e6fV2AS2ViveP+wRwf65jK0H5IC8lNxzm4b+mBTRbLCyX7l/PZZmPu07QTTNJZe+aHoOqzdfdk1pdW7+gOZys/ym8DKqFPr4sjfZqBV7CuN6yQrA6/PlNzbLNtQfupwCD7EIJDysuzGXfUpOzo/GaQbOkgQ4u0f+ehKvVJ+M= MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9ab0dda4-ce2a-40ec-6f9d-08d6a0e93a5b X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Mar 2019 21:34:48.9421 (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-Transport-CrossTenantHeadersStamped: MN2PR21MB1183 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When we unload pci-hyperv, the host doesn't send us a PCI_EJECT message. In this case we also need to make sure the sysfs pci slot directory is removed, otherwise "cat /sys/bus/pci/slots/2/address" will trigger "BUG: unable to handle kernel paging request" (I noticed the issue when systemd-dev crashed for me when I unloaded the driver). And, if we unload/reload the driver several times, we'll have multiple pci slot directories in /sys/bus/pci/slots/ like this: root@localhost:~# ls -rtl /sys/bus/pci/slots/ total 0 drwxr-xr-x 2 root root 0 Feb 7 10:49 2 drwxr-xr-x 2 root root 0 Feb 7 10:49 2-1 drwxr-xr-x 2 root root 0 Feb 7 10:51 2-2 The patch adds the missing code. Fixes: a15f2c08c708 ("PCI: hv: support reporting serial number as slot information") Signed-off-by: Dexuan Cui Acked-by: Stephen Hemminger Cc: stable@vger.kernel.org Reviewed-by: Michael Kelley --- drivers/pci/controller/pci-hyperv.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index 30f16b882746..b489412e3502 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -1486,6 +1486,21 @@ static void hv_pci_assign_slots(struct hv_pcibus_device *hbus) } } +/* + * Remove entries in sysfs pci slot directory. + */ +static void hv_pci_remove_slots(struct hv_pcibus_device *hbus) +{ + struct hv_pci_dev *hpdev; + + list_for_each_entry(hpdev, &hbus->children, list_entry) { + if (!hpdev->pci_slot) + continue; + pci_destroy_slot(hpdev->pci_slot); + hpdev->pci_slot = NULL; + } +} + /** * create_root_hv_pci_bus() - Expose a new root PCI bus * @hbus: Root PCI bus, as understood by this driver @@ -2680,6 +2695,7 @@ static int hv_pci_remove(struct hv_device *hdev) pci_lock_rescan_remove(); pci_stop_root_bus(hbus->pci_bus); pci_remove_root_bus(hbus->pci_bus); + hv_pci_remove_slots(hbus); pci_unlock_rescan_remove(); hbus->state = hv_pcibus_removed; }