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drm/i915: Warn on if set frontbuffer return value is not NULL on release

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i915_gem_object_set_frontbuffer returns set frontbuffer pointer.  When we
are releasing frontbuffer we are clearing the pointer from the object. Warn
on if return value is not null.

v3: Check i915_gem_object_set_frontbuffer return value separately
v2: Instead of ignoring do drm_WARN_ON

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230928082924.164720-1-jouni.hogander@intel.com
This commit is contained in:
Jouni Högander 2023-09-28 11:29:24 +03:00
parent f67ff36f21
commit a9d0eb95db
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/i915/display/intel_frontbuffer.c
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@ -251,7 +251,7 @@ static void frontbuffer_retire(struct i915_active *ref)
static void frontbuffer_release(struct kref *ref)
__releases(&intel_bo_to_i915(front->obj)->display.fb_tracking.lock)
{
struct intel_frontbuffer *front =
struct intel_frontbuffer *ret, *front =
container_of(ref, typeof(*front), ref);
struct drm_i915_gem_object *obj = front->obj;
@ -259,7 +259,8 @@ static void frontbuffer_release(struct kref *ref)
i915_ggtt_clear_scanout(obj);
i915_gem_object_set_frontbuffer(obj, NULL);
ret = i915_gem_object_set_frontbuffer(obj, NULL);
drm_WARN_ON(&intel_bo_to_i915(obj)->drm, ret);
spin_unlock(&intel_bo_to_i915(obj)->display.fb_tracking.lock);
i915_active_fini(&front->write);