[PATCH 5/7] drm/xe: Handle missing migration VM on VM creation

[Stuart Summers <stuart.summers@intel.com>]

Theoretically, a user could attempt to create a VM
while the migration VM is for some reason being
destroyed such that the xe_vm_create() routine gets
called, but when we assign a migration exec queue
to that VM, the VM for that migration exec queue is
no longer there. Add an error check here for that
case.

Signed-off-by: Stuart Summers <stuart.summers@intel.com>
---
 drivers/gpu/drm/xe/xe_exec_queue.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_exec_queue.c b/drivers/gpu/drm/xe/xe_exec_queue.c
index c31bc8411a71..6baa19b8051c 100644
--- a/drivers/gpu/drm/xe/xe_exec_queue.c
+++ b/drivers/gpu/drm/xe/xe_exec_queue.c
@@ -326,6 +326,9 @@ struct xe_exec_queue *xe_exec_queue_create_bind(struct xe_device *xe,
 	struct xe_vm *migrate_vm;
 
 	migrate_vm = xe_migrate_get_vm(tile->migrate);
+	if (!migrate_vm)
+		return ERR_PTR(-ENODEV);
+
 	if (xe->info.has_usm) {
 		struct xe_hw_engine *hwe = xe_gt_hw_engine(gt,
 							   XE_ENGINE_CLASS_COPY,
-- 
2.34.1