4.10-stable review patch. If anyone has any objections, please let me know.
------------------ From: Yisheng Xie <[email protected]> commit 9c57b5808c625f4fc93da330b932647eaff321f7 upstream. With CONFIG_BALLOON_COMPACTION=y the kernel will mount balloon_mnt for balloon page migration when we probe a virtio_balloon device. However we do not unmount it when removing the device. Fix this. Fixes: b1123ea6d3b3 ("mm: balloon: use general non-lru movable page feature") Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Yisheng Xie <[email protected]> Acked-by: Minchan Kim <[email protected]> Cc: Rafael Aquini <[email protected]> Cc: Konstantin Khlebnikov <[email protected]> Cc: Gioh Kim <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Michael S. Tsirkin <[email protected]> Cc: Jason Wang <[email protected]> Cc: Hanjun Guo <[email protected]> Cc: Xishi Qiu <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/virtio/virtio_balloon.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -615,8 +615,12 @@ static void virtballoon_remove(struct vi cancel_work_sync(&vb->update_balloon_stats_work); remove_common(vb); +#ifdef CONFIG_BALLOON_COMPACTION if (vb->vb_dev_info.inode) iput(vb->vb_dev_info.inode); + + kern_unmount(balloon_mnt); +#endif kfree(vb); }
