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| author | Rusty Russell <rusty@rustcorp.com.au> | 2008-02-05 07:50:03 +0300 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-02-04 15:50:03 +0300 |
| commit | 6e5aa7efb27aec7e55b6463fa2c8db594c4226fa (patch) | |
| tree | 060a955e711ac224136157a5410e88dcdab965af /include/linux/virtio.h | |
| parent | b3369c1fb410fddeb38a404316c861395f6d6ae8 (diff) | |
| download | linux-6e5aa7efb27aec7e55b6463fa2c8db594c4226fa.tar.xz | |
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.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 78408d5237c1..260d1fcf29a4 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); }; /** |