[Nouveau] [Bug 88514] X segfaults when using prime offloading to nouveau card

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88514

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
Right, the bug is just that we attempted to dereference a DRI2ScreenPtr on a
GPU screen for which DRI2 was never initialised (due to NoAccel). So we have 2
bugs:

1. The code should be more robust and only add an offload_slave if DRI2 was
enabled on that Screen (or be prepared for lies).

2. Nouveau shouldn't be claiming to be an offload slave if it doesn't support
offloading (due to NoAccel).

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