[ Upstream commit 1b9366c601 ]
If waiting for gpu reset done in KFD release_work, thers is WARNING:
possible circular locking dependency detected
#2 kfd_create_process
kfd_process_mutex
flush kfd release work
#1 kfd release work
wait for amdgpu reset work
#0 amdgpu_device_gpu_reset
kgd2kfd_pre_reset
kfd_process_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock((work_completion)(&p->release_work));
lock((wq_completion)kfd_process_wq);
lock((work_completion)(&p->release_work));
lock((wq_completion)amdgpu-reset-dev);
To fix this, KFD create process move flush release work outside
kfd_process_mutex.
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Philip Yang
2059e6ea11