virtio: Allow virtio to be modular and used by modules

This is needed for the virtio PCI device to be compiled as a module.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

3 files changed, 14 insertions, 2 deletions

diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
index 9e33fc4da875..de0c8c2654ef 100644
--- a/drivers/virtio/Kconfig
+++ b/drivers/virtio/Kconfig
@@ -1,8 +1,8 @@
 # Virtio always gets selected by whoever wants it.
 config VIRTIO
-        bool
+        tristate
 
 # Similarly the virtio ring implementation.
 config VIRTIO_RING
-        bool
+        tristate
         depends on VIRTIO
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 7dddb1860936..b535483bc556 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -162,4 +162,12 @@ static int virtio_init(void)
                 panic("virtio bus registration failed");
         return 0;
 }
+
+static void __exit virtio_exit(void)
+{
+        bus_unregister(&virtio_bus);
+}
 core_initcall(virtio_init);
+module_exit(virtio_exit);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 74c245092b5c..3a28c1382131 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -266,6 +266,7 @@ irqreturn_t vring_interrupt(int irq, void *_vq)
 
         return IRQ_HANDLED;
 }
+EXPORT_SYMBOL_GPL(vring_interrupt);
 
 static struct virtqueue_ops vring_vq_ops = {
         .add_buf = vring_add_buf,
@@ -318,9 +319,12 @@ struct virtqueue *vring_new_virtqueue(unsigned int num,
 
         return &vq->vq;
 }
+EXPORT_SYMBOL_GPL(vring_new_virtqueue);
 
 void vring_del_virtqueue(struct virtqueue *vq)
 {
         kfree(to_vvq(vq));
 }
+EXPORT_SYMBOL_GPL(vring_del_virtqueue);
 
+MODULE_LICENSE("GPL");