Crypto API
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
Herbert Xu
maintainerQuoted 10 lines · Dmitry Kasatkin
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()
crypto_kmap is for software crypto. If you're doing DMA, you shouldn't use it.
Please take a look at other crypto drivers under drivers/crypto as to how DMA should be implemented.
Cheers,
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