[Bug 15203] r300 lockup

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=15203





--- Comment #25 from Markus Amsler <mar...@or...>  2008-04-01 12:27:49 PST ---
I know now whats happening. If the ring buffer gets low on space
radeon_wait_ring is called. If writeback is enabled radeon_wait_ring can run
into the -EBUSY timeout, because it's possible that during the timeout the CP
won't update the ring pointer (few slow gpu commands in the ring buffer). Now
the -EBUSY timeout isn't handled at all, so the ring buffer gets overwritten,
with undefined result.
I'm still thinking of a clever way to fix this.


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