[Bug 94980] [HSW xf86-video-intel] 2D acceleration slows to a crawl from 4.4.6 -> 4.5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94980

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
Created attachment 123012
  --> https://bugs.freedesktop.org/attachment.cgi?id=123012&action=edit
Block SIGIO when we are trying to flip

Compile tested only.

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