When destroying a BO with a userspace managed address and thus freeing
the VMA space, we need to make sure that the BO isn't in use by any
active submit anymore, as the kernel will rightfully reject the next
submit that re-uses the still active VMA. Keep the BO alive as long
as it isn't fully idle to prevent the VMA being reused prematurely.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14159>
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