[Intel-gfx] [PATCH 4/4] drm/i915: Wait for reset to complete before returning from debugfs/i915_wedged

[Chris Wilson]

Provide some serialisation between user operations by waiting for the
reset initiated by setting i915_wedged to complete.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
---
 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 5fdf8c137235..ada823815b8a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4129,6 +4129,10 @@ i915_wedged_set(void *data, u64 val)
 	i915_handle_error(dev_priv, val,
 			  "Manually setting wedged to %llu", val);
 
+	wait_on_bit(&dev_priv->gpu_error.flags,
+		    I915_RESET_HANDOFF,
+		    TASK_UNINTERRUPTIBLE);
+
 	return 0;
 }
 
-- 
2.11.0