[PATCH 5.15 041/206] drm/amd: Clean up kfd node on surprise disconnect

Greg Kroah-Hartman
2026-02-04T14:53:42Z

From: Mario Limonciello (AMD) <superm1@kernel.org>

commit 28695ca09d326461f8078332aa01db516983e8a2 upstream.

When an eGPU is unplugged the KFD topology should also be destroyed
for that GPU. This never happens because the fini_sw callbacks never
get to run. Run them manually before calling amdgpu_device_ip_fini_early()
when a device has already been disconnected.

This location is intentionally chosen to make sure that the kfd locking
refcount doesn't get incremented unintentionally.

Cc: kent.russell@amd.com
Closes: https://community.frame.work/t/amd-egpu-on-linux/8691/33
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Reviewed-by: Kent Russell <kent.russell@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 6a23e7b4332c10f8b56c33a9c5431b52ecff9aab)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 8 ++++++++
1 file changed, 8 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3999,6 +3999,14 @@ void amdgpu_device_fini_hw(struct amdgpu

amdgpu_irq_fini_hw(adev);

+ /*
+ * device went through surprise hotplug; we need to destroy topology
+ * before ip_fini_early to prevent kfd locking refcount issues by calling
+ * amdgpu_amdkfd_suspend()
+ */
+ if (drm_dev_is_unplugged(adev_to_drm(adev)))
+ amdgpu_amdkfd_device_fini_sw(adev);
+
amdgpu_device_ip_fini_early(adev);

amdgpu_gart_dummy_page_fini(adev);