Re: [PATCH] mutex: Always clear owner field upon mutex_unlock()

[Davidlohr Bueso]

On Tue, 2015-01-06 at 10:29 +0000, Chris Wilson wrote:
> Currently if DEBUG_MUTEXES is enabled, the mutex->owner field is only
> cleared iff debug_locks is active. This exposes a race to other users of
> the field where the mutex->owner may be still set to a stale value,
> potentially upsetting mutex_spin_on_owner() among others.
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=87955
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>

Acked-by: Davidlohr Bueso <dave@xxxxxxxxxxxx>

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