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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/tee/optee/supp.c
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@@ -1,15 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (c) 2015, Linaro Limited
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- *
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- * This software is licensed under the terms of the GNU General Public
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- * License version 2, as published by the Free Software Foundation, and
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- * may be copied, distributed, and modified under those terms.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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  */
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 #include <linux/device.h>
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 #include <linux/slab.h>
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@@ -88,13 +79,21 @@
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 {
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 	struct optee *optee = tee_get_drvdata(ctx->teedev);
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 	struct optee_supp *supp = &optee->supp;
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-	struct optee_supp_req *req = kzalloc(sizeof(*req), GFP_KERNEL);
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+	struct optee_supp_req *req;
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 	bool interruptable;
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 	u32 ret;
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 	unsigned long timeleft;
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 	int id;
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 	struct optee_supp_req *get_req;
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+	/*
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+	 * Return in case there is no supplicant available and
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+	 * non-blocking request.
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+	 */
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+	if (!supp->ctx && ctx->supp_nowait)
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+		return TEEC_ERROR_COMMUNICATION;
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+
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+	req = kzalloc(sizeof(*req), GFP_KERNEL);
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 	if (!req)
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 		return TEEC_ERROR_OUT_OF_MEMORY;
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