Oh, it looks like all pause_reading() and resume_reading() methods of transports check the status the transport (especially the _closing attribute), except two transports: _UnixReadPipeTransport and _SSLProtocolTransport.

For _SSLProtocolTransport, I don't think that it matters because this transport is not used directly, but through _SelectorSslTransport or _ProactorSocketTransport and these transports already check the status.

Here is a patch for _UnixReadPipeTransport, without patch yet.