virtio: explicit enable_cb/disable_cb rather than callback return.
It seems that virtio_net wants to disable callbacks (interrupts) before
calling netif_rx_schedule(), so we can't use the return value to do so.
Rename "restart" to "cb_enable" and introduce "cb_disable" hook: callback
now returns void, rather than a boolean.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 1dc04b6..342bb03 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -220,7 +220,17 @@
return ret;
}
-static bool vring_restart(struct virtqueue *_vq)
+static void vring_disable_cb(struct virtqueue *_vq)
+{
+ struct vring_virtqueue *vq = to_vvq(_vq);
+
+ START_USE(vq);
+ BUG_ON(vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT);
+ vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
+ END_USE(vq);
+}
+
+static bool vring_enable_cb(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
@@ -254,8 +264,8 @@
return IRQ_HANDLED;
pr_debug("virtqueue callback for %p (%p)\n", vq, vq->vq.callback);
- if (vq->vq.callback && !vq->vq.callback(&vq->vq))
- vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
+ if (vq->vq.callback)
+ vq->vq.callback(&vq->vq);
return IRQ_HANDLED;
}
@@ -264,7 +274,8 @@
.add_buf = vring_add_buf,
.get_buf = vring_get_buf,
.kick = vring_kick,
- .restart = vring_restart,
+ .disable_cb = vring_disable_cb,
+ .enable_cb = vring_enable_cb,
.shutdown = vring_shutdown,
};
@@ -272,7 +283,7 @@
struct virtio_device *vdev,
void *pages,
void (*notify)(struct virtqueue *),
- bool (*callback)(struct virtqueue *))
+ void (*callback)(struct virtqueue *))
{
struct vring_virtqueue *vq;
unsigned int i;