[PATCH 4.9 17/61] virtio: add ability to iterate over vqs

From: Greg Kroah-Hartman
Date: Mon Apr 30 2018 - 16:26:53 EST


4.9-stable 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.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
include/linux/virtio.h | 3 +++
1 file changed, 3 insertions(+)

--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -143,6 +143,9 @@ int virtio_device_freeze(struct virtio_d
int virtio_device_restore(struct virtio_device *dev);
#endif

+#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).