From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756003Ab1LAR73 (ORCPT ); Thu, 1 Dec 2011 12:59:29 -0500 Received: from p3plsmtps2ded03.prod.phx3.secureserver.net ([208.109.80.60]:33031 "HELO p3plsmtps2ded03-01.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755787Ab1LAR73 (ORCPT ); Thu, 1 Dec 2011 12:59:29 -0500 From: "K. Y. Srinivasan" To: gregkh@suse.de, linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, virtualization@lists.osdl.org, ohering@suse.com Cc: "K. Y. Srinivasan" , Sasha Levin Subject: [PATCH 1/1] drivers: hv: Don't OOPS when you cannot init vmbus Date: Thu, 1 Dec 2011 09:59:34 -0800 Message-Id: <1322762374-14161-1-git-send-email-kys@microsoft.com> X-Mailer: git-send-email 1.7.4.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The hv vmbus driver was causing an OOPS since it was trying to register drivers on top of the bus even if initialization of the bus has failed for some reason (such as the odd chance someone would run a hv enabled kernel in a non-hv environment). Signed-off-by: Sasha Levin Signed-off-by: K. Y. Srinivasan --- drivers/hv/vmbus_drv.c | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 0c048dd..d3b0b4f 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -62,6 +62,14 @@ struct hv_device_info { struct hv_dev_port_info outbound; }; +static int vmbus_exists(void) +{ + if (hv_acpi_dev == NULL) + return -ENODEV; + + return 0; +} + static void get_channel_info(struct hv_device *device, struct hv_device_info *info) @@ -590,6 +598,10 @@ int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, c pr_info("registering driver %s\n", hv_driver->name); + ret = vmbus_exists(); + if (ret < 0) + return ret; + hv_driver->driver.name = hv_driver->name; hv_driver->driver.owner = owner; hv_driver->driver.mod_name = mod_name; @@ -614,6 +626,9 @@ void vmbus_driver_unregister(struct hv_driver *hv_driver) { pr_info("unregistering driver %s\n", hv_driver->name); + if (!vmbus_exists()) + return; + driver_unregister(&hv_driver->driver); } @@ -776,6 +791,7 @@ static int __init hv_acpi_init(void) cleanup: acpi_bus_unregister_driver(&vmbus_acpi_driver); + hv_acpi_dev = NULL; return ret; } -- 1.7.4.1