Re: cipher implementations allowed to sleep?

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Am Donnerstag, 31. März 2016, 17:21:06 schrieb Herbert Xu:

Hi Herbert,

> On Thu, Mar 31, 2016 at 11:18:48AM +0200, Stephan Mueller wrote:
> > Hi Herbert,
> > 
> > is it allowed that cipher implementations sleep? The driver of my question
> > is whether I can use spin_lock_irqsave() as a lock around a cipher
> > operation.
> > 
> > The cipher operations in question are hashing, HMACing and symmetric
> > ciphers.
> Whether they can sleep is controlled by the MAY_SLEEP flag.
> 
> Of course, even if they can't sleep, if you invoke an async op
> then it may return -EINPROGRESS and continue the processing in
> the background.

Right, I was always thinking about sync invocations.

Thanks.

Ciao
Stephan
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