drm/amdgpu: fix ACP MFD device leak on init failure

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acp_hw_init() registers ACP child devices with mfd_add_devices() before
attaching them to the ACP power domain and initializing the hardware.

If attaching a child to the power domain fails, or if the ACP reset or
clock enable operation times out, the failure path frees only the
source cell, resource, and platform-data allocations. The child
platform devices already registered by mfd_add_devices() remain
registered and are never released.

Remove the children from the power domain and unregister the MFD
devices on failures that occur after mfd_add_devices() succeeds. Keep
mfd_add_devices() failures on the existing cleanup path since the MFD
core already rolls back partially registered children itself.

The issue was identified by a static analysis tool I developed and
confirmed by manual review.

Fixes: 25030321ba ("drm/amd: add pm domain for ACP IP sub blocks")
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 63da68d6a2)
Cc: stable@vger.kernel.org

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Guangshuo Li 2026-09-21 18:33:18 +08:00 • committed by Alex Deucher

parent f5a5add360

commit f001304615

1 changed files with 9 additions and 4 deletions

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

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