[Bug 101652] segfault in i965 brw_upload_cache when calling glLinkProgram

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101652

Kenneth Graunke <kenneth at whitecape.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTOURBUG
             Status|NEW                         |RESOLVED

--- Comment #1 from Kenneth Graunke <kenneth at whitecape.org> ---
We talked about this on IRC today, and vsyrjala noticed that the example
program fopens the rendernode with "w" mode - for writing, but not reading. 
The fix is to use "r+" (reading and writing).

Apparently if you can't read from the rendernode device, then GTT mappings
fail, which gives us a NULL pointer for the program cache map.

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