[Bug 198669] Driver crash at radeon_ring_backup+0xd3/0x140 [radeon]

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https://bugzilla.kernel.org/show_bug.cgi?id=198669

--- Comment #6 from Christian König (christian.koenig@xxxxxxx) ---
Well the issue is triggered by the driver reading nonsense values from the
hardware.

E.g. we ask the hardware what the last good position on a 16k ring buffer is
and get 0xffffffff as result (or something like this) which obviously can't be
correct.

My patch mitigated that by clamping the value to a valid range, but if you read
nonsense values from the hardware because the hardware has a loose connection
and acts strange on vibrations then I basically can't guarantee for anything.

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