[PATCH v2 2/3] drm/i915/guc: Close deregister-context race against CT-loss

[Teres Alexis, Alan Previn]

just a follow up note-to-self:

On Tue, 2023-08-15 at 12:08 -0700, Teres Alexis, Alan Previn wrote:
> On Tue, 2023-08-15 at 09:56 -0400, Vivi, Rodrigo wrote:
> > On Mon, Aug 14, 2023 at 06:12:09PM -0700, Alan Previn wrote:
> > > 
[snip]

in guc_submission_send_busy_loop, we are incrementing the following
that needs to be decremented if the function fails.

atomic_inc(&guc->outstanding_submission_g2h);

also, it seems that even with thie unroll design - we are still
leaking a wakeref elsewhere. this is despite a cleaner redesign of
flows in function "guc_lrc_desc_unpin"
(discussed earlier that wasnt very readible).

will re-rev today but will probably need more follow ups
tracking that one more leaking gt-wakeref (one in thousands-cycles)
but at least now we are not hanging mid-suspend.. we bail from suspend
with useful kernel messages.