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Commit 9af20792 authored by Daniel Vetter's avatar Daniel Vetter Committed by Alex Deucher
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drm/radeon: fix fence locking in the pageflip callback 



We need to hold bdev->fence_lock while grabbing a reference to
the fence, to prevent concurrent clearing/changing of the
ttm_bo->sync_obj field.

Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 2c385151

drivers/gpu/drm/radeon/radeon_display.c

+4 −0
Original line number Diff line number Diff line
@@ -378,8 +378,12 @@ static int radeon_crtc_page_flip(struct drm_crtc *crtc, 
	work->old_rbo = rbo;

	obj = new_radeon_fb->obj;

	rbo = gem_to_radeon_bo(obj);



	spin_lock(&rbo->tbo.bdev->fence_lock);

	if (rbo->tbo.sync_obj)

		work->fence = radeon_fence_ref(rbo->tbo.sync_obj);

	spin_unlock(&rbo->tbo.bdev->fence_lock);



	INIT_WORK(&work->work, radeon_unpin_work_func);



	/* We borrow the event spin lock for protecting unpin_work */