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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: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-12-01 09:59:34 -08:00 committed by Greg Kroah-Hartman
parent d2554f50df
commit cf6a2eacbc
1 changed files with 16 additions and 0 deletions
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16
drivers/hv/vmbus_drv.c
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@ -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;
}