drm/amdgpu: Skip KFD mapping clear before initialization

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amdgpu_amdkfd_clear_kfd_mapping() assumes that a non-NULL kfd_dev
has a fully populated node array. This is not true when KFD device
initialization fails after probe.

For example, kgd2kfd_device_init() sets num_nodes before checking
PCIe atomics support. On Polaris systems without the required atomics,
it returns before allocating nodes[0], but the kfd_dev remains attached
to the amdgpu device. A later GPU reset then dereferences nodes[0]->id.

Require the authoritative KFD initialization flag before walking the
node array, matching the existing KFD reset and teardown paths.

Fixes: 70cadefcc6 ("drm/amdgpu: unmap all user mappings of framebuffer and doorbell before mode1 reset")
Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5833
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 4ac1835823)
Cc: stable@vger.kernel.org

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Mario Limonciello 2026-09-15 12:51:24 -05:00 • committed by Alex Deucher

parent 0d2f4cfa56

commit 7f9caa70ae

1 changed files with 1 additions and 1 deletions

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drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c

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