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authorRusty Russell <rusty@rustcorp.com.au>2008-02-04 23:50:03 -0500
committerRusty Russell <rusty@rustcorp.com.au>2008-02-04 23:50:03 +1100
commit6e5aa7efb27aec7e55b6463fa2c8db594c4226fa (patch)
tree060a955e711ac224136157a5410e88dcdab965af /include/linux/virtio.h
parentb3369c1fb410fddeb38a404316c861395f6d6ae8 (diff)
downloadop-kernel-dev-6e5aa7efb27aec7e55b6463fa2c8db594c4226fa.zip
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virtio: reset function
A reset function solves three problems: 1) It allows us to renegotiate features, eg. if we want to upgrade a guest driver without rebooting the guest. 2) It gives us a clean way of shutting down virtqueues: after a reset, we know that the buffers won't be used by the host, and 3) It helps the guest recover from messed-up drivers. So we remove the ->shutdown hook, and the only way we now remove feature bits is via reset. We leave it to the driver to do the reset before it deletes queues: the balloon driver, for example, needs to chat to the host in its remove function. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/virtio.h')
-rw-r--r--include/linux/virtio.h5
1 files changed, 0 insertions, 5 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 78408d5..260d1fc 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -45,9 +45,6 @@ struct virtqueue
* vq: the struct virtqueue we're talking about.
* This returns "false" (and doesn't re-enable) if there are pending
* buffers in the queue, to avoid a race.
- * @shutdown: "unadd" all buffers.
- * vq: the struct virtqueue we're talking about.
- * Remove everything from the queue.
*
* Locking rules are straightforward: the driver is responsible for
* locking. No two operations may be invoked simultaneously.
@@ -67,8 +64,6 @@ struct virtqueue_ops {
void (*disable_cb)(struct virtqueue *vq);
bool (*enable_cb)(struct virtqueue *vq);
-
- void (*shutdown)(struct virtqueue *vq);
};
/**
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