[Intel-gfx] IVB page flipping fixes (hopefully final)

[Kenneth Graunke]

On 06/16/2011 09:19 AM, Jesse Barnes wrote:
> This set addresses comments from Dan and Chris, namely:
>    - pin&  fence the new fb on the correct ring for IVB
>    - cleanup gen2/3 wait code by putting it in gen2/3 wait functions
>    - remove dead code
>    - fix a race in the split code with the interrupt handler and flip pending
>
> Thanks,
> Jesse

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>