[PATCH 3.16 223/366] virtio: add ability to iterate over vqs

[Ben Hutchings]

3.16.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Michael S. Tsirkin" <mst@xxxxxxxxxx>

commit 24a7e4d20783c0514850f24a5c41ede46ab058f0 upstream.

For cleanup it's helpful to be able to simply scan all vqs and discard
all data. Add an iterator to do that.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 include/linux/virtio.h | 3 +++
 1 file changed, 3 insertions(+)

--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -108,6 +108,9 @@ void unregister_virtio_device(struct vir
 
 void virtio_break_device(struct virtio_device *dev);
 
+#define virtio_device_for_each_vq(vdev, vq) \
+	list_for_each_entry(vq, &vdev->vqs, list)
+
 /**
  * virtio_driver - operations for a virtio I/O driver
  * @driver: underlying device driver (populate name and owner).