On Sat, Feb 02, 2019 at 10:25:43AM +0800, Zhou Wang wrote: > > In fact, I planned to register to acomp later. > > It also makes sense to use scomp if hardware engine is faster than CPU. > So how about registering to scomp firstly, then we register this engine to > acomp later? Sorry, but the fact that you're doing a busy-wait for completion means that scomp is not an appropriate choice. Cheers, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt