tree b4cc8e6405803d731b4bcd70a20c37c36f7e40a5
parent 79208c57da5311860f165b613c89b3f647e357cd
author K. Y. Srinivasan <kys@microsoft.com> 1420876470 -0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1422206277 -0800

Drivers: hv: hv_balloon: Fix a locking bug in the balloon driver

We support memory hot-add in the Hyper-V balloon driver by hot adding an appropriately
sized and aligned region and controlling the on-lining of pages within that region
based on the pages that the host wants us to online. We do this because the
granularity and alignment requirements in Linux are different from what Windows
expects. The state to manage the onlining of pages needs to be correctly
protected. Fix this bug.

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