Merge tag 'virtio-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty...

Pull virtio update from Rusty Russell:
 "Virtio patches, mainly hotplugging fixes."

* tag 'virtio-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  virtio-blk: return VIRTIO_BLK_F_FLUSH to header.
  virtio-blk: allow toggling host cache between writeback and writethrough
  virtio-blk: Use block layer provided spinlock
  virtio-blk: Reset device after blk_cleanup_queue()
  virtio-blk: Call del_gendisk() before disable guest kick
  virtio: rng: s3/s4 support
  virtio: rng: split out common code in probe / remove for s3/s4 ops
  virtio: rng: don't wait on host when module is going away
  virtio: rng: allow tasks to be killed that are waiting for rng input
  virtio ids: fix comment for virtio-rng