Re: [PATCH v3 1/3] crypto: hw_random - Add new Exynos RNG driver

[Krzysztof Kozlowski]

On Sun, Mar 26, 2017 at 07:05:48PM +0200, Stephan MÃller wrote:
> Am Sonntag, 26. MÃrz 2017, 18:46:02 CEST schrieb PrasannaKumar Muralidharan:
> 
> Hi 	Krzysztof,
> 
> > >> > +       if (slen < EXYNOS_RNG_SEED_SIZE) {
> > >> > +               dev_warn(rng->dev, "Seed too short (only %u bytes)\n",
> > >> > slen); +               return -EINVAL;
> > >> > +       }
> > >> 
> > >> Will it be helpful to print the required seed size?
> > > 
> > > It is in /proc/crypto... It is not a problem to print it but isn't that
> > > redundant?
> > 
> > Not necessary if it is already available.
> 
> Maybe the dev_warn should be removed. Note, unprivileged user space can 
> trigger this warning by simply invoking the seeding operation over and over 
> again with an insufficient seed size. This would clutter the log.

Makes sense. The generic dev_dbg() before would bring enough
information.

Best regards,
Krzysztof