[PATCH 4/6] fb: Avoid installing terminal functions over pre-existing call chains

[Keith Packard]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> The fbWindow family of functions (Map, Unmap, Position and Destroy) are
> all terminal functions, that is they do not chain up to earlier
> extensions. This breaks those chains which leads to not only resource
> leaks but also dereference of dangling pointers. One such issue arises
> with fbScreenInit() breaking the earlier present_screen_init() and
> causing the Xserver to die when a Window is closed after being used with
> Present and fb:

fb expects to be initialized first, before any extensions, so that its
terminal functions will always be at the bottom of the call chain.

-- 
keith.packard at intel.com
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