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drm/nouveau: handle same-fb page flips 

It's questionable use case, but weston/wayland already relies on this
behaviour, and other drivers don't care about it, so it's a matter of
compatibility.  Without it, process invoking such page flip hangs in
unkillable state, trying to reserve the same buffer twice.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Marcin Slusarz 2012-10-05 12:26:32 +02:00 committed by Ben Skeggs
parent 565f571c48
commit 2c14575f99
1 changed files with 9 additions and 5 deletions
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14
drivers/gpu/drm/nouveau/nouveau_display.c
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@ -530,9 +530,11 @@ nouveau_page_flip_reserve(struct nouveau_bo *old_bo,
if (ret)
goto fail;
ret = ttm_bo_reserve(&old_bo->bo, false, false, false, 0);
if (ret)
goto fail_unreserve;
if (likely(old_bo != new_bo)) {
ret = ttm_bo_reserve(&old_bo->bo, false, false, false, 0);
if (ret)
goto fail_unreserve;
}
return 0;
@ -551,8 +553,10 @@ nouveau_page_flip_unreserve(struct nouveau_bo *old_bo,
nouveau_bo_fence(new_bo, fence);
ttm_bo_unreserve(&new_bo->bo);
nouveau_bo_fence(old_bo, fence);
ttm_bo_unreserve(&old_bo->bo);
if (likely(old_bo != new_bo)) {
nouveau_bo_fence(old_bo, fence);
ttm_bo_unreserve(&old_bo->bo);
}
nouveau_bo_unpin(old_bo);
}