[Bug 45018] [bisected] rendering regression since added support for virtual address space on cayman v11

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=45018

--- Comment #72 from awaters1 at gmail.com <awaters1 at gmail.com> 2012-08-01 02:09:17 UTC ---
Also, I believe the source of "radeon 0000:01:00.0: bo ffff8802ea5ec800 va
0x038EC000 conflict with (bo ffff8803eb464000 0x038EC000 0x038ED000)" is due to
a race condition.  It appears that after the call to radeon_bomgr_free_va the
virtual address space is in a state where user space sees that freed address as
available but the kernel hasn't been notified yet, until the drmIoctl call I
assume.

I'm not sure if there are multiple threads allowed to interact with
radeon_drm_bo.c, but if there are then the user space can request a virtual
address that hasn't been freed yet by the kernel.

I moved the call to radeon_bomgr_free_va to be after the drmIoctl
inradeon_bo_destroy,  I'll run through the piglit tests to see if it fixes the
errors.

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