[Intel-gfx] [PATCH] drm/i915: Hold rpm wakeref for debugfs/i915_drop_caches_set

[Chris Wilson]

Since we peek into HW state and poke around, it behoves us to acquire a
runtime pm wakeref beforehand.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108364
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 7b7f844d325b..80dec5740de0 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4187,6 +4187,7 @@ i915_drop_caches_set(void *data, u64 val)
 
 	DRM_DEBUG("Dropping caches: 0x%08llx [0x%08llx]\n",
 		  val, val & DROP_ALL);
+	intel_runtime_pm_get(i915);
 
 	if (val & DROP_RESET_ACTIVE && !intel_engines_are_idle(i915))
 		i915_gem_set_wedged(i915);
@@ -4246,6 +4247,8 @@ i915_drop_caches_set(void *data, u64 val)
 	if (val & DROP_FREED)
 		i915_gem_drain_freed_objects(i915);
 
+	intel_runtime_pm_put(i915);
+
 	return ret;
 }
 
-- 
2.19.1