int optee_open()

in optee/core.c [74:115]

• 37 lines of code
• 7 McCabe index (conditional complexity)

int optee_open(struct tee_context *ctx, bool cap_memref_null)
{
	struct optee_context_data *ctxdata;
	struct tee_device *teedev = ctx->teedev;
	struct optee *optee = tee_get_drvdata(teedev);

	ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
	if (!ctxdata)
		return -ENOMEM;

	if (teedev == optee->supp_teedev) {
		bool busy = true;

		mutex_lock(&optee->supp.mutex);
		if (!optee->supp.ctx) {
			busy = false;
			optee->supp.ctx = ctx;
		}
		mutex_unlock(&optee->supp.mutex);
		if (busy) {
			kfree(ctxdata);
			return -EBUSY;
		}

		if (!optee->scan_bus_done) {
			INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
			optee->scan_bus_wq = create_workqueue("optee_bus_scan");
			if (!optee->scan_bus_wq) {
				kfree(ctxdata);
				return -ECHILD;
			}
			queue_work(optee->scan_bus_wq, &optee->scan_bus_work);
			optee->scan_bus_done = true;
		}
	}
	mutex_init(&ctxdata->mutex);
	INIT_LIST_HEAD(&ctxdata->sess_list);

	ctx->cap_memref_null = cap_memref_null;
	ctx->data = ctxdata;
	return 0;
}