Chris Wilson <ch...@chris-wilson.co.uk> writes:
> Use lockdep to warn before we wait indefinitely in case we may be
> waiting indefinitely.
>
> Suggested-by: Mika Kuoppala <mika.kuopp...@intel.com>
> References: 2caffbf11762 ("drm/i915: Revoke mmaps and prevent access to fence
> registers across reset")
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuopp...@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuopp...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_reset.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reset.c
> b/drivers/gpu/drm/i915/i915_reset.c
> index c1b53533ada6..12e74decd7a2 100644
> --- a/drivers/gpu/drm/i915/i915_reset.c
> +++ b/drivers/gpu/drm/i915/i915_reset.c
> @@ -1305,6 +1305,9 @@ int i915_reset_trylock(struct drm_i915_private *i915)
> struct i915_gpu_error *error = &i915->gpu_error;
> int srcu;
>
> + might_lock(&error->reset_backoff_srcu);
> + might_sleep();
> +
> rcu_read_lock();
> while (test_bit(I915_RESET_BACKOFF, &error->flags)) {
> rcu_read_unlock();
> --
> 2.20.1
>
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