[PATCH v3 17/19] drm/i915/overlay: Don't use fetch_and_zero() in display code

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

We don't generally want fetch_and_zero() on the display side, so
stop using it in the display side intel_overlay_cleanup().
Fortunately we don't really have anything to do here apart from
freeing the data. And we'll keep on clearing the pointer, just
in case something somewhere cares about it.

Note that once i915_overlay_cleanup() is converted to the parent
interface we can't call it unconditionally (as xe won't have it).
So we need to keep the early bailout for overlay==NULL.

v2: Adjust the commit message since we do apparently
    have fetch_and_zero() in display code as well (Jani)
v3: Skip i915_overlay_cleanup() if the overlay wasn't initialized

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_overlay.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_overlay.c b/drivers/gpu/drm/i915/display/intel_overlay.c
index 10a235ce608e..37c60c08dd56 100644
--- a/drivers/gpu/drm/i915/display/intel_overlay.c
+++ b/drivers/gpu/drm/i915/display/intel_overlay.c
@@ -1554,13 +1554,11 @@ static void i915_overlay_cleanup(struct drm_device *drm)
 
 void intel_overlay_cleanup(struct intel_display *display)
 {
-	struct intel_overlay *overlay;
-
-	overlay = fetch_and_zero(&display->overlay);
-	if (!overlay)
+	if (!display->overlay)
 		return;
 
 	i915_overlay_cleanup(display->drm);
 
-	kfree(overlay);
+	kfree(display->overlay);
+	display->overlay = NULL;
 }
-- 
2.52.0