Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus

* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  lguest: notify on empty
  virtio: force callback on empty.
  virtio_blk: fix endianess annotations
  virtio_config: fix len calculation of config elements
  virtio_net: another race with virtio_net and enable_cb
  virtio: An entropy device, as suggested by hpa.
  virtio_blk: allow read-only disks
  lguest: fix ugly <NULL> in /proc/interrupts
  virtio: set device index in common code.
  virtio: virtio_pci should not set bus_id.
  virtio: bus_id for devices should contain 'virtio'
  Fix crash in virtio_blk during modprobe ; rmmod ; modprobe
  lguest: use ioremap_cache, not ioremap

1 files changed, 10 insertions, 2 deletions

diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index 3be8ab2a886a..82fafe0429fe 100644
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -157,6 +157,9 @@ struct virtqueue
 
         /* The routine to call when the Guest pings us. */
         void (*handle_output)(int fd, struct virtqueue *me);
+
+        /* Outstanding buffers */
+        unsigned int inflight;
 };
 
 /* Remember the arguments to the program so we can "reboot" */
@@ -702,6 +705,7 @@ static unsigned get_vq_desc(struct virtqueue *vq,
                         errx(1, "Looped descriptor");
         } while ((i = next_desc(vq, i)) != vq->vring.num);
 
+        vq->inflight++;
         return head;
 }
 
@@ -719,6 +723,7 @@ static void add_used(struct virtqueue *vq, unsigned int head, int len)
         /* Make sure buffer is written before we update index. */
         wmb();
         vq->vring.used->idx++;
+        vq->inflight--;
 }
 
 /* This actually sends the interrupt for this virtqueue */
@@ -726,8 +731,9 @@ static void trigger_irq(int fd, struct virtqueue *vq)
 {
         unsigned long buf[] = { LHREQ_IRQ, vq->config.irq };
 
-        /* If they don't want an interrupt, don't send one. */
-        if (vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
+        /* If they don't want an interrupt, don't send one, unless empty. */
+        if ((vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
+            && vq->inflight)
                 return;
 
         /* Send the Guest an interrupt tell them we used something up. */
@@ -1107,6 +1113,7 @@ static void add_virtqueue(struct device *dev, unsigned int num_descs,
         vq->next = NULL;
         vq->last_avail_idx = 0;
         vq->dev = dev;
+        vq->inflight = 0;
 
         /* Initialize the configuration. */
         vq->config.num = num_descs;
@@ -1368,6 +1375,7 @@ static void setup_tun_net(const char *arg)
 
         /* Tell Guest what MAC address to use. */
         add_feature(dev, VIRTIO_NET_F_MAC);
+        add_feature(dev, VIRTIO_F_NOTIFY_ON_EMPTY);
         set_config(dev, sizeof(conf), &conf);
 
         /* We don't need the socket any more; setup is done. */