On 30.08.2018 15:09, Krzysztof Kozlowski wrote: > [...] > Thanks Stephan for hints. Let's assume the each of init, update and > final are atomic... but how about the relation between update and > final? I have two concurrent users in user-space but only one HW: > > Process A: Process B: > init() and set_key() > init() and different key > update(some_data) > update(different_data) > final() > final() > > The final() from process A will now produce the result of hashing/CRC > of some_data and different_data (and even maybe mixed with init() for > different key). All because in the meantime process B added its own > data to the HW. > > Best regards, > Krzysztof Can your hardware do export/import ? If yes, you can use workqueue and guard HW with spinlock, as in exynos hash in s5p-sss.c (or see other drivers). -- Best regards, Kamil Konieczny Samsung R&D Institute Poland
