Quoting Chris Wilson (2019-02-01 10:22:48)
> If we get caught in a kernel bug, we may never idle. Let the user regain
> control of their system^Wterminal by responding to SIGINT!
>
> Reported-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index f3fa31d840f5..baf8b548621c 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -3947,6 +3947,10 @@ i915_drop_caches_set(void *data, u64 val)
>
> if (val & DROP_IDLE) {
> do {
> + if (signal_pending(current)) {
> + ret = -EINTR;
> + goto out;
> + }
> if (READ_ONCE(i915->gt.active_requests))
> flush_delayed_work(&i915->gt.retire_work);
> drain_delayed_work(&i915->gt.idle_work);
Drain delayed work will want similar treatment.
-Chris
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