virtio: find_vqs/del_vqs virtio operations

This replaces find_vq/del_vq with find_vqs/del_vqs virtio operations,
and updates all drivers. This is needed for MSI support, because MSI
needs to know the total number of vectors upfront.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (+ lguest/9p compile fixes)

1 files changed, 11 insertions, 15 deletions

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 58684e4a081..c74dacfa679 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -188,6 +188,9 @@ static void hvc_handle_input(struct virtqueue *vq)
  * Finally we put our input buffer in the input queue, ready to receive. */
 static int __devinit virtcons_probe(struct virtio_device *dev)
 {
+        vq_callback_t *callbacks[] = { hvc_handle_input, NULL};
+        const char *names[] = { "input", "output" };
+        struct virtqueue *vqs[2];
         int err;
 
         vdev = dev;
@@ -199,20 +202,15 @@ static int __devinit virtcons_probe(struct virtio_device *dev)
                 goto fail;
         }
 
-        /* Find the input queue. */
+        /* Find the queues. */
         /* FIXME: This is why we want to wean off hvc: we do nothing
          * when input comes in. */
-        in_vq = vdev->config->find_vq(vdev, 0, hvc_handle_input, "input");
-        if (IS_ERR(in_vq)) {
-                err = PTR_ERR(in_vq);
+        err = vdev->config->find_vqs(vdev, 2, vqs, callbacks, names);
+        if (err)
                 goto free;
-        }
 
-        out_vq = vdev->config->find_vq(vdev, 1, NULL, "output");
-        if (IS_ERR(out_vq)) {
-                err = PTR_ERR(out_vq);
-                goto free_in_vq;
-        }
+        in_vq = vqs[0];
+        out_vq = vqs[1];
 
         /* Start using the new console output. */
         virtio_cons.get_chars = get_chars;
@@ -233,17 +231,15 @@ static int __devinit virtcons_probe(struct virtio_device *dev)
         hvc = hvc_alloc(0, 0, &virtio_cons, PAGE_SIZE);
         if (IS_ERR(hvc)) {
                 err = PTR_ERR(hvc);
-                goto free_out_vq;
+                goto free_vqs;
         }
 
         /* Register the input buffer the first time. */
         add_inbuf();
         return 0;
 
-free_out_vq:
-        vdev->config->del_vq(out_vq);
-free_in_vq:
-        vdev->config->del_vq(in_vq);
+free_vqs:
+        vdev->config->del_vqs(vdev);
 free:
         kfree(inbuf);
 fail: