drm/i915: fix possible refcount leak when resetting forcewake

If the timer putting the last forcewake refcount was pending and we
canceled it, we'll leak the corresponding forcewake and RPM references.

v2:
- do the ptr casting at the caller instead of adding a separate helper
  for this (Chris)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 79cba593df0d..4f6fef7ac069 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -320,7 +320,8 @@ static void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore)
         struct drm_i915_private *dev_priv = dev->dev_private;
         unsigned long irqflags;
 
-        del_timer_sync(&dev_priv->uncore.force_wake_timer);
+        if (del_timer_sync(&dev_priv->uncore.force_wake_timer))
+                gen6_force_wake_timer((unsigned long)dev_priv);
 
         /* Hold uncore.lock across reset to prevent any register access
          * with forcewake not set correctly