Drivers: hv: balloon: Make the balloon driver not unloadable
K. Y. Srinivasan [Fri, 15 Mar 2013 19:25:42 +0000 (12:25 -0700)]
The balloon driver is stateful. For instance, it needs to keep track of pages
that have been ballooned out to properly post pressure reports. This state cannot
be re-constructed if the driver were to be unloaded and subsequently loaded.
Furthermore, as we support memory hot-add as part of this driver, this driver becomes
even more stateful and this state cannot be re-created. Make the balloon driver
unloadable to deal with this issue.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/hv_balloon.c

index 13fda38..4743db9 100644 (file)
@@ -1096,14 +1096,7 @@ static int __init init_balloon_drv(void)
        return vmbus_driver_register(&balloon_drv);
 }
 
-static void exit_balloon_drv(void)
-{
-
-       vmbus_driver_unregister(&balloon_drv);
-}
-
 module_init(init_balloon_drv);
-module_exit(exit_balloon_drv);
 
 MODULE_DESCRIPTION("Hyper-V Balloon");
 MODULE_VERSION(HV_DRV_VERSION);