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.
Acked-by: Sudeep Holla sudeep.holla@arm.com Signed-off-by: Etienne Carriere etienne.carriere@linaro.org --- No change since v6
Changes since v5: - Applied Sudeep's review tag
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 e123de6e8c67..25bfb465484d 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;