Commit cf6a2eac authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
Browse files

drivers: hv: Don't OOPS when you cannot init vmbus 



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: default avatarSasha Levin <levinsasha928@gmail.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent d2554f50

drivers/hv/vmbus_drv.c

+16 −0
Original line number Original line Diff line number Diff line
@@ -62,6 +62,14 @@ struct hv_device_info { 
	struct hv_dev_port_info outbound;

	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,

static void get_channel_info(struct hv_device *device,

			     struct hv_device_info *info)

			     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);

	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.name = hv_driver->name;

	hv_driver->driver.owner = owner;

	hv_driver->driver.owner = owner;

	hv_driver->driver.mod_name = mod_name;

	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);

	pr_info("unregistering driver %s\n", hv_driver->name);





	if (!vmbus_exists())

		return;



	driver_unregister(&hv_driver->driver);

	driver_unregister(&hv_driver->driver);





}

}
@@ -776,6 +791,7 @@ static int __init hv_acpi_init(void) 




cleanup:

cleanup:

	acpi_bus_unregister_driver(&vmbus_acpi_driver);

	acpi_bus_unregister_driver(&vmbus_acpi_driver);

	hv_acpi_dev = NULL;

	return ret;

	return ret;

}

}

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