[Intel-gfx] Potential BUG in drm/i915/execlists: Reset RING registers upon resume

[Greg Kroah-Hartman]

On Mon, Mar 20, 2017 at 05:01:34PM +0200, Jani Nikula wrote:
> On Tue, 14 Mar 2017, Eric Blau <eblau at eblau.com> wrote:
> > That's funny. I have a MacBook Pro 12,1 from late 2015. Hibernate
> > failed for me in 4.9.6 through 4.9.8 (possibly earlier as well, I do
> > no recall) without the patch. The patch you reference fixed my problem
> > and apparently many others based on the bug reports:
> >
> > https://bugs.freedesktop.org/show_bug.cgi?id=96526
> >
> > I applied the patch myself in 4.9.6 through 4.9.8 and hibernate works
> > for me. I have run vanilla 4.9.9 and 4.10.1 and in both hibernate
> > works.
> 
> So I'm quite surprised
> 
> commit f2a0409a08502d64fbe3990354dff5902b08d2fb
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Wed Sep 21 14:51:08 2016 +0100
> 
>     drm/i915/execlists: Reset RING registers upon resume
>     
>     commit bafb2f7d4755bf1571bd5e9a03b97f3fc4fe69ae upstream.
> 
> ended up in v4.9.9 considering that the upstream commit is not annotated
> for stable, it has no Fixes: tags, and I can't find any backport
> requests or even notifications for it in my mails. (Admittedly I'm not
> subscribed on stable@, but I'd expect our lists, maintainers or
> developers be Cc'd.)

Eric sent this to the stable list a few times, my mistake for not seeing
he hadn't also cc:ed the developer list.

Want me to revert it?

thanks,

greg k-h