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drm/radeon: take a BO reference on VM cleanup 

This closes a small window where the GPU might have accessed freed up memory.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2014-07-30 21:04:57 +02:00 committed by Alex Deucher
parent 512d8afc5d
commit ee26d83ff0
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/radeon/radeon_vm.c
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@ -450,6 +450,7 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
tmp->it.last = bo_va->it.last;
tmp->vm = vm;
tmp->addr = bo_va->addr;
tmp->bo = radeon_bo_ref(bo_va->bo);
list_add(&tmp->vm_status, &vm->freed);
}
@ -932,6 +933,7 @@ int radeon_vm_clear_freed(struct radeon_device *rdev,
list_for_each_entry_safe(bo_va, tmp, &vm->freed, vm_status) {
r = radeon_vm_bo_update(rdev, bo_va, NULL);
radeon_bo_unref(&bo_va->bo);
kfree(bo_va);
if (r)
return r;
@ -987,7 +989,7 @@ void radeon_vm_bo_rmv(struct radeon_device *rdev,
list_del(&bo_va->vm_status);
if (bo_va->addr) {
bo_va->bo = NULL;
bo_va->bo = radeon_bo_ref(bo_va->bo);
list_add(&bo_va->vm_status, &vm->freed);
} else {
kfree(bo_va);
@ -1098,8 +1100,10 @@ void radeon_vm_fini(struct radeon_device *rdev, struct radeon_vm *vm)
kfree(bo_va);
}
}
list_for_each_entry_safe(bo_va, tmp, &vm->freed, vm_status)
list_for_each_entry_safe(bo_va, tmp, &vm->freed, vm_status) {
radeon_bo_unref(&bo_va->bo);
kfree(bo_va);
}
for (i = 0; i < radeon_vm_num_pdes(rdev); i++)
radeon_bo_unref(&vm->page_tables[i].bo);