mm balloon: umount balloon_mnt when removing vb device

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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: b1123ea6d3 ("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]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

This commit is contained in:

Yisheng Xie

2017-02-24 17:46:56 -08:00

committed by

Linus Torvalds

parent 85caa95b9f

commit 9c57b5808c

1 changed files with 4 additions and 0 deletions

									
										drivers/virtio/virtio_balloon.c
									
		+4
		
												View File
												
				@@ -615,8 +615,12 @@ static void virtballoon_remove(struct virtio_device *vdev)

					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);

				}