HVC console breakage

[Benjamin Herrenschmidt]

On Wed, 2012-11-14 at 13:57 +1100, Anton Blanchard wrote:
> Hi,
> 
> Commit bdb498c20040 (TTY: hvc_console, add tty install) breaks HVC on
> ppc64. It looks a bit like a refcounting issue and we end up releasing
> the tty. I haven't had a change to look closer yet.

Adding Paulus who is looking into it. So far what we observe is that
something (possibly a close() on a hvc tty by userspace) causes the port
to be destroyed permanently. Typically hits with fedora 17.

Cheers,
Ben.