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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: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Daniel Vetter 2012-12-11 23:42:24 +01:00 committed by Alex Deucher
parent 2c385151ed
commit 9af2079212
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/radeon/radeon_display.c
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@ -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 */