[Intel-gfx] [PATCH] drm/i915/gt: Prevent immediate reuse of the last context tag

[Chris Wilson]

Quoting Chris Wilson (2020-08-05 09:37:51)
> While we only release the context tag after we have processed the
> context-switch event away from the context, be paranoid in case that
> value remains live in HW and so avoid reusing the last tag for the next
> context after a brief idle.
> 

Fixes: 5c4a53e3b1cb ("drm/i915/execlists: Track inflight CCID")
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Ramalingam C <ramalingam.c at intel.com>
Cc: <stable at vger.kernel.org> # v5.5+
-Chris