Zack Rusin 7ac9578e45 drm/vmwgfx: Remove rcu locks from user resources ... [ Upstream commit a309c7194e ] User resource lookups used rcu to avoid two extra atomics. Unfortunately the rcu paths were buggy and it was easy to make the driver crash by submitting command buffers from two different threads. Because the lookups never show up in performance profiles replace them with a regular spin lock which fixes the races in accesses to those shared resources. Fixes kernel oops'es in IGT's vmwgfx execution_buffer stress test and seen crashes with apps using shared resources. Fixes: e14c02e6b6 ("drm/vmwgfx: Look up objects without taking a reference") Signed-off-by: Zack Rusin <zackr@vmware.com> Reviewed-by: Martin Krastev <krastevm@vmware.com> Reviewed-by: Maaz Mombasawala <mombasawalam@vmware.com> Link: https://patchwork.freedesktop.org/patch/msgid/20221207172907.959037-1-zack@kde.org Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-01-18 11:58:28 +01:00
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drm	drm/vmwgfx: Remove rcu locks from user resources	2023-01-18 11:58:28 +01:00
host1x	gpu: host1x: Avoid trying to use GART on Tegra20	2022-11-18 09:33:20 +01:00
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