Crypto API

[Dmitry Kasatkin <dmitry.kasatkin@nokia.com>]

Hi,

I develop some drivers for crypto HW and met some difficulties.
Some algorithm functions are called behind crypto_kmap()

data = crypto_kmap(sg_page(sg), 0);

It will do inc_preempt_count();

I try to use DMA controller to perform memory transfers and try to use
wait_for_completion()

But of course  it gives

BUG: sleeping function called from invalid context at kernel/sched.c:5786

What is the best way to handle such case?

Thanks,
Dmitry