diff options
| author | Jonathan Kim <jonathan.kim@amd.com> | 2021-06-11 20:36:34 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-19 11:00:59 +0300 |
| commit | ade6d90105c3f2611dc949e4dad57e2df130f6f4 (patch) | |
| tree | 722739339e55b8fbbbf6728d6081044461699c46 /drivers/gpu | |
| parent | 87b509e32365c9b7833238f7dcc86afa82e75200 (diff) | |
| download | linux-ade6d90105c3f2611dc949e4dad57e2df130f6f4.tar.xz | |
drm/amdkfd: fix circular locking on get_wave_state
[ Upstream commit 63f6e01237257e7226efc5087f3f0b525d320f54 ]
get_wave_state acquires the mmap_lock on copy_to_user but so do
mmu_notifiers. mmu_notifiers allows dqm locking so do get_wave_state
outside the dqm_lock to prevent circular locking.
v2: squash in unused variable removal.
Signed-off-by: Jonathan Kim <jonathan.kim@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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 28 |
1 files changed, 13 insertions, 15 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c index a4266c4bca13..df05eca73275 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c @@ -1677,29 +1677,27 @@ static int get_wave_state(struct device_queue_manager *dqm, u32 *save_area_used_size) { struct mqd_manager *mqd_mgr; - int r; dqm_lock(dqm); - if (q->properties.type != KFD_QUEUE_TYPE_COMPUTE || - q->properties.is_active || !q->device->cwsr_enabled) { - r = -EINVAL; - goto dqm_unlock; - } - mqd_mgr = dqm->mqd_mgrs[KFD_MQD_TYPE_CP]; - if (!mqd_mgr->get_wave_state) { - r = -EINVAL; - goto dqm_unlock; + if (q->properties.type != KFD_QUEUE_TYPE_COMPUTE || + q->properties.is_active || !q->device->cwsr_enabled || + !mqd_mgr->get_wave_state) { + dqm_unlock(dqm); + return -EINVAL; } - r = mqd_mgr->get_wave_state(mqd_mgr, q->mqd, ctl_stack, - ctl_stack_used_size, save_area_used_size); - -dqm_unlock: dqm_unlock(dqm); - return r; + + /* + * get_wave_state is outside the dqm lock to prevent circular locking + * and the queue should be protected against destruction by the process + * lock. + */ + return mqd_mgr->get_wave_state(mqd_mgr, q->mqd, ctl_stack, + ctl_stack_used_size, save_area_used_size); } static int process_termination_cpsch(struct device_queue_manager *dqm, |