[Bug 90741] Radeon: System pauses on TAHITI

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=90741

--- Comment #71 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
Thanks for helping investigate, I will send the attachment as a bugfix to bug
90861, that bug is specifically about the waitqueue ordering in
radeon_fence_default_wait. That one was really caused by me.

The bug here just happened to be triggered more reliably because there is a lot
less wait time between sw_irq_get and radeon_fence_read. It needs some kind of
barrier but I'm not sure which one. The radeon dev Alex Deucher will look into
it and talk with some other people about the proper way to fix this.

Thanks for all your help, I'll cc you when I send my bugfix.

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