drivers: entropy: stm32 entropy driver add semaphore protection #72882
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Add a semaphore to protect the disable access to the RNG peripheral when the PM is going to suspend mode. Signed-off-by: Francois Ramu <francois.ramu@st.com>
erwango
requested changes
May 16, 2024
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Issue is that in release_rng following is done:
entropy_stm32_suspend();
#if defined(CONFIG_SOC_SERIES_STM32WBX) || defined(CONFIG_STM32H7_DUAL_CORE)
z_stm32_hsem_unlock(CFG_HW_RNG_SEMID);
#endif /* CONFIG_SOC_SERIES_STM32WBX || CONFIG_STM32H7_DUAL_CORE */
So current implementation will end up with 2 consecutive z_stm32_hsem_unlock.
To take this into account, what about:
Calling release_rng instead of entropy_stm32_suspend and call lock semaphore before calls in entropy_stm32_rng_pm_action.
(maybe some function renaming would be required in the end to make all this more clear)
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When the PM is going to suspend mode, this change is adding a semaphore to protect the access to the RNG peripheral
Fixes #72640