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Explicitly document return behaviour

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A bug existed previously where this guarantee was not met,
causing some issues in multi-threaded code.

Signed-off-by: Ryan Everett <ryan.everett@arm.com>
This commit is contained in:
Ryan Everett
2024-04-29 18:26:19 +01:00
parent dd90507dc6
commit 04e2b04f7f
1 changed files with 3 additions and 0 deletions
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3
library/psa_crypto_slot_management.h
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@@ -58,6 +58,9 @@ static inline int psa_key_id_is_volatile(psa_key_id_t key_id)
* It is the responsibility of the caller to call psa_unregister_read(slot) * It is the responsibility of the caller to call psa_unregister_read(slot)
* when they have finished reading the contents of the slot. * when they have finished reading the contents of the slot.
* *
* On failure, `*p_slot` is set to NULL. This ensures that it is always valid
* to call psa_unregister_read on the returned slot.
*
* \param key Key identifier to query. * \param key Key identifier to query.
* \param[out] p_slot On success, `*p_slot` contains a pointer to the * \param[out] p_slot On success, `*p_slot` contains a pointer to the
* key slot containing the description of the key * key slot containing the description of the key