"crypto_hash_setkey" call from atomic context

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Hello,

I am investigating the current usage of kernel crypto-libraries in the
SCTP code, considering to adopt the same crypto framework for the
MPTCP implementation.

In sm_make_chunk.c, the crypto function "crypto_hash_setkey" is called
in an atomic context, despite the fact that this function CAN invoke a
GFP_KERNEL (sleeping) memory allocation. Calling a sleeping function
from an atomic context can end up in deadlock.
Is there a way to make sure that “crypto_hash_setkey” can be safely
called in an atomic context, considering all the possible code-paths
followed by the function?

Thanks,
Fabrizio
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