Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio, pci: fixes

More fixes for 2.9.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Wed 29 Mar 2017 00:35:49 BST
# gpg:                using RSA key 0x281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>"
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* remotes/mst/tags/for_upstream:
  virtio: fix vring_align() on 64-bit windows
  pci: Add missing drop of bus master AS reference
  event_notifier: prevent accidental use after close

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>