Merge git://git.infradead.org/users/willy/linux-nvme

[karo-tx-linux.git] / drivers / virtio / virtio_ring.c

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 1e443629f76d725f7223e4d9234b0cf47e942b0e..4d08f45a9c29aeba18fe4c174bce0a644a090d57 100644 (file)
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -865,4 +865,19 @@ bool virtqueue_is_broken(struct virtqueue *_vq)
 }
 EXPORT_SYMBOL_GPL(virtqueue_is_broken);
 
+/*
+ * This should prevent the device from being used, allowing drivers to
+ * recover.  You may need to grab appropriate locks to flush.
+ */
+void virtio_break_device(struct virtio_device *dev)
+{
+       struct virtqueue *_vq;
+
+       list_for_each_entry(_vq, &dev->vqs, list) {
+               struct vring_virtqueue *vq = to_vvq(_vq);
+               vq->broken = true;
+       }
+}
+EXPORT_SYMBOL_GPL(virtio_break_device);
+
 MODULE_LICENSE("GPL");