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-rw-r--r--drivers/tee/optee/supp.c10
-rw-r--r--drivers/tee/tee_core.c13
2 files changed, 22 insertions, 1 deletions
diff --git a/drivers/tee/optee/supp.c b/drivers/tee/optee/supp.c
index 43626e15703a..92f56b8645e3 100644
--- a/drivers/tee/optee/supp.c
+++ b/drivers/tee/optee/supp.c
@@ -88,10 +88,18 @@ u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params,
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_supp *supp = &optee->supp;
- struct optee_supp_req *req = kzalloc(sizeof(*req), GFP_KERNEL);
+ struct optee_supp_req *req;
bool interruptable;
u32 ret;
+ /*
+ * Return in case there is no supplicant available and
+ * non-blocking request.
+ */
+ if (!supp->ctx && ctx->supp_nowait)
+ return TEEC_ERROR_COMMUNICATION;
+
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
return TEEC_ERROR_OUT_OF_MEMORY;
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index 7b2bb4c50058..adf2588282fc 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -106,6 +106,11 @@ static int tee_open(struct inode *inode, struct file *filp)
if (IS_ERR(ctx))
return PTR_ERR(ctx);
+ /*
+ * Default user-space behaviour is to wait for tee-supplicant
+ * if not present for any requests in this context.
+ */
+ ctx->supp_nowait = false;
filp->private_data = ctx;
return 0;
}
@@ -982,6 +987,14 @@ tee_client_open_context(struct tee_context *start,
} while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM);
put_device(put_dev);
+ /*
+ * Default behaviour for in kernel client is to not wait for
+ * tee-supplicant if not present for any requests in this context.
+ * Also this flag could be configured again before call to
+ * tee_client_open_session() if any in kernel client requires
+ * different behaviour.
+ */
+ ctx->supp_nowait = true;
return ctx;
}
EXPORT_SYMBOL_GPL(tee_client_open_context);