[Bug 253461] LinuxKPI: [AMD/ATI] RV730 PRO [Radeon HD 4650] crashes kernel

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 10 Jan 2022 15:44:47 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253461

--- Comment #10 from Vladimir Kondratyev <wulf@freebsd.org> ---
(In reply to Bill Paul from comment #9)
The analysis and patch LGTM. Thank you.

This unlock/lock pair exists only in FreeBSD version of drm. It was introduced
in 4.12 by johalun@ to workaround unknown bug, probably taking sleepable lock
with non-slepable lock held and effectively reverted in 4.19 with comment
"Fixes amdgpu".

I'll try to test it on i915 after getting some spare time to ensure that the
"unknown bug" does not resurrect.

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