vsock: prevent transport modules unloading
This patch adds 'module' member in the 'struct vsock_transport' in order to get/put the transport module. This prevents the module unloading while sockets are assigned to it. We increase the module refcnt when a socket is assigned to a transport, and we decrease the module refcnt when the socket is destructed. Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NJorgen Hansen <jhansen@vmware.com> Signed-off-by: NStefano Garzarella <sgarzare@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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