linux-kernel - [PATCH 1/3] tee: optee: Allow to freeze the task waiting for tee-supplicant

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Date:   Fri, 16 Jul 2021 17:44:58 +0200
From:   Christoph Gellner <cgellner@...adit-jv.com>
To:     <op-tee@...ts.trustedfirmware.org>, <linux-kernel@...r.kernel.org>
CC:     <jens.wiklander@...aro.org>,
        Christoph Gellner <cgellner@...adit-jv.com>
Subject: [PATCH 1/3] tee: optee: Allow to freeze the task waiting for tee-supplicant

When the system is going to hibernate or suspend it might happen
that the tee-supplicant task is frozen first.
wait_for_completion_interruptible might get stuck in this case.

Add try_to_freeze to allow the waiting task to be frozen while
waiting for the response of tee-supplicant.

Signed-off-by: Christoph Gellner <cgellner@...adit-jv.com>
---
 drivers/tee/optee/supp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tee/optee/supp.c b/drivers/tee/optee/supp.c
index 322a543b8c27..03c37bae6ac4 100644
--- a/drivers/tee/optee/supp.c
+++ b/drivers/tee/optee/supp.c
@@ -5,6 +5,7 @@
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
+#include <linux/freezer.h>
 #include "optee_private.h"
 
 struct optee_supp_req {
@@ -141,6 +142,8 @@ u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params,
 			req->ret = TEEC_ERROR_COMMUNICATION;
 			break;
 		}
+
+		try_to_freeze();
 	}
 
 	ret = req->ret;
-- 
2.32.0.rc0