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Subject[PATCH v5 4/4] firmware: arm_scmi: optee: use optee system invocation
Date
Changes SCMI optee transport to call tee_client_system_session()
to request optee driver to provision an entry context in OP-TEE
for processing OP-TEE messages. This prevents possible deadlock
in case OP-TEE threads are all consumed while these may be waiting
for a clock or regulator to be enable which SCMI OP-TEE service which
requires a free thread context to execute.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
---
Changes since v4:
- Updated to new API function tee_client_system_session() introduced
in patch v5 2/3.

No change since v3

Changes since v2:
- Fixed syntax issues (missing ';' chars), reported by kernel test robot.

Changes since v1:
- Updated to use new tee API functions tee_client_request_system_context()
and tee_client_release_system_context().
---
drivers/firmware/arm_scmi/optee.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/optee.c
index 2a7aeab40e54..22a755160c2f 100644
--- a/drivers/firmware/arm_scmi/optee.c
+++ b/drivers/firmware/arm_scmi/optee.c
@@ -440,6 +440,10 @@ static int scmi_optee_chan_setup(struct scmi_chan_info *cinfo, struct device *de
if (ret)
goto err_free_shm;

+ ret = tee_client_system_session(scmi_optee_private->tee_ctx, channel->tee_session);
+ if (ret)
+ dev_warn(dev, "Could not switch to system session, do best effort\n");
+
ret = get_channel(channel);
if (ret)
goto err_close_sess;
--
2.25.1
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