Quoting Chris Wilson (2019-12-03 15:26:31)
> Only along the submission path can we guarantee that the locked request
> is indeed from a foreign engine, and so the nesting of engine/rq is
> permissible. On the submission tasklet (process_csb()), we may find
> ourselves competing with the normal nesting of rq/engine, invalidating
> our nesting. As we only use the spinlock for debug purposes, skip the
> debug if we cannot acquire the spinlock for safe validation - catching
> 99% of the bugs is better than causing a hard lockup.
>
Fixes: c95d31c3df1b ("drm/i915/execlists: Lock the request while validating it
during promotion")
> Signed-off-by: Chris Wilson <[email protected]>
> Cc: Tvrtko Ursulin <[email protected]>
-Chris
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