[PATCH v4 3/4] drm/xe: Take a ref to xe file when user creates a VM

[Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>]

Take a reference to xef when user creates the VM and put the reference
when user destroys the VM.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 drivers/gpu/drm/xe/xe_vm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index b6932cc98ff9..d9aadb8ec737 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -1674,6 +1674,10 @@ static void vm_destroy_work_func(struct work_struct *w)
 
 	trace_xe_vm_free(vm);
 	ttm_lru_bulk_move_fini(&xe->ttm, &vm->lru_bulk_move);
+
+	if (vm->xef)
+		xe_file_put(vm->xef);
+
 	kfree(vm);
 }
 
@@ -1806,7 +1810,7 @@ int xe_vm_create_ioctl(struct drm_device *dev, void *data,
 	}
 
 	args->vm_id = id;
-	vm->xef = xef;
+	vm->xef = xe_file_get(xef);
 
 	/* Record BO memory for VM pagetable created against client */
 	for_each_tile(tile, xe, id)
-- 
2.38.1