Re: [PATCH] cryptoapi: Fix sleeping

[Andrew Morton <akpm@osdl.org>]

Jeff Garzik <jgarzik@pobox.com> wrote:
>
> Matt Mackall wrote:
> > We need in_atomic() so that we can call from regions where preempt is
> > disabled, for instance when using per_cpu crypto tfms.
> > 
> > diff -urN -X dontdiff orig/crypto/internal.h work/crypto/internal.h
> > --- orig/crypto/internal.h	2003-07-13 22:29:11.000000000 -0500
> > +++ work/crypto/internal.h	2003-08-12 14:38:54.000000000 -0500
> > @@ -37,7 +37,7 @@
> >  
> >  static inline void crypto_yield(struct crypto_tfm *tfm)
> >  {
> > -	if (!in_softirq())
> > +	if (!in_atomic())
> >  		cond_resched();
> 
> 
> Do you really want to schedule inside preempt_disable() ?
> 

in_atomic() returns false inside spin_lock() on non-preemptive kernels.

Either this code needs to be removed altogether or it should be changed to

	BUG_ON(in_atomic());
	cond_resched();

and the callers should be fixed up.