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Message-ID: <1515007850-17169-1-git-send-email-prime.zeng@hisilicon.com> Date: Thu, 4 Jan 2018 03:30:50 +0800 From: Zeng Tao <prime.zeng@...ilicon.com> To: <jens.wiklander@...aro.org> CC: <linux-kernel@...r.kernel.org>, <tee-dev@...ts.linaro.org> Subject: [PATCH] optee: fix the dead loop problem when there is signal pending when the current process is doing a rpc call from optee, and if there is a signal pending on the process, it will enter dead loop if the tee-supplicant is working correctly, fix the problem by breaking out the loop when the rpc job is finished. Signed-off-by: Zeng Tao <prime.zeng@...ilicon.com> --- drivers/tee/optee/supp.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/tee/optee/supp.c b/drivers/tee/optee/supp.c index b4ea067..170dedb 100644 --- a/drivers/tee/optee/supp.c +++ b/drivers/tee/optee/supp.c @@ -107,6 +107,13 @@ u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params, mutex_unlock(&supp->ctx_mutex); if (interruptable) break; + + /* + * if there is signal pending, and the supplicant has finished + * the rpc job, we need to break out the loop + */ + if (try_wait_for_completion(&supp->data_from_supp)) + break; } ret = supp->ret; -- 2.7.4
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