On Fri, Mar 3, 2017 at 5:13 AM, David Miller <davem@xxxxxxxxxxxxx> wrote:
> From: Peng Tao <bergwolf@xxxxxxxxx>
> Date: Wed, 1 Mar 2017 11:56:24 +0800
>
>> So that we can cancel a queued pkt later if necessary.
>>
>> Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
>> Signed-off-by: Peng Tao <bergwolf@xxxxxxxxx>
>> ---
>> include/linux/virtio_vsock.h | 2 ++
>> net/vmw_vsock/virtio_transport_common.c | 7 +++++++
>> 2 files changed, 9 insertions(+)
>>
>> diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
>> index 9638bfe..193ad3a 100644
>> --- a/include/linux/virtio_vsock.h
>> +++ b/include/linux/virtio_vsock.h
>> @@ -48,6 +48,7 @@ struct virtio_vsock_pkt {
>> struct virtio_vsock_hdr hdr;
>> struct work_struct work;
>> struct list_head list;
>> + void *cancel_token; /* only used for cancellation */
>
> The type here is fixed, you only store vhost_sock object pointers
> here, so don't use "void *" please.
It used to be "struct vhost_sock *" but no refcount is held. Stefan
suggested to use "void *cancel_token" to make the code harder to
misuse.
Quoting Stefan:
"This field is just an opaque token used for cancellation rather than
a struct vsock_sock pointer that we are allowed to dereference. You
could change this field to void *cancel_token to make the code harder
to misuse."
Ref:
https://www.mail-archive.com/netdev@xxxxxxxxxxxxxxx/msg142550.html
Cheers,
Tao
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