Merge tag 'drm-xe-next-fixes-2023-12-26' of https://gitlab.freedesktop.org/drm/xe/kernel into drm-next

- Fix couple unfined behavior cases to calm UBSAN and clang (Matt Brost, Lucas)

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ZYsbDPBLUiqDevLt@intel.com

drivers/gpu/drm/xe/xe_vm.c

@@ -279,6 +279,9 @@ static int add_preempt_fences(struct xe_vm *vm, struct xe_bo *bo)
 	struct xe_exec_queue *q;
 	int err;
 
+	if (!vm->preempt.num_exec_queues)
+		return 0;
+
 	err = xe_bo_lock(bo, true);
 	if (err)
 		return err;

drivers/gpu/drm/xe/xe_wait_user_fence.c

@@ -46,6 +46,7 @@ static int do_compare(u64 addr, u64 value, u64 mask, u16 op)
 		break;
 	default:
 		XE_WARN_ON("Not possible");
+		return -EINVAL;
 	}
 
 	return passed ? 0 : 1;