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The auxiliary device registration was using a hardcoded ID of 0, which caused probe() to fail on multi-GPU systems with: sysfs: cannot create duplicate filename '/bus/auxiliary/devices/NovaCore.nova-drm.0' Fix this by using an atomic counter to generate unique IDs for each GPU's aux device registration. The TODO item to eventually use XArray for recycling aux device IDs is retained, but for now, this works very nicely. This has the side effect of making debugfs[1] work on multi-GPU systems. [1] https://lore.kernel.org/20260203224757.871729-1-ttabi@nvidia.com Reviewed-by: Gary Guo <gary@garyguo.net> Signed-off-by: John Hubbard <jhubbard@nvidia.com> Link: https://patch.msgid.link/20260221020952.412352-2-jhubbard@nvidia.com [ Use LKMM atomics; inline and slightly reword TODO comment. - Danilo ] Signed-off-by: Danilo Krummrich <dakr@kernel.org>