linux

iv/linux

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Rouven Czerwinski 9f02b8f61f tee: optee: add might_sleep for RPC requests

If the kernel is compiled with CONFIG_PREEMPT_VOLUNTARY and OP-TEE is
executing a long running workload, the following errors are raised:

[ 1705.971228] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
[ 1705.977195] rcu:     (detected by 0, t=2102 jiffies, g=51977, q=3)
[ 1705.983152] rcu: All QSes seen, last rcu_sched kthread activity 2102 (140596-138494), jiffies_till_next_fqs=1, root ->qsmask 0x0
[ 1705.994729] optee-xtest     R  running task        0   169    157 0x00000002

While OP-TEE is returning regularly to the kernel due to timer
interrupts, the OPTEE_SMC_FUNC_FOREIGN_INTR case does not contain an
explicit rescheduling point. Add a might_sleep() to the RPC request case
to ensure that the kernel can reschedule another task if OP-TEE requests
RPC handling.

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

2019-07-08 22:38:56 +02:00

call.c

tee: optee: add might_sleep for RPC requests

2019-07-08 22:38:56 +02:00

core.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282

2019-06-05 17:36:37 +02:00

device.c

tee: optee: Fix unsigned comparison with less than zero

2019-02-20 17:57:47 +01:00

Kconfig

treewide: Add SPDX license identifier - Makefile/Kconfig