Re: [PATCH v2 1/2] hwrng: fetch randomness only after device init
From: Jason Cooper
Date: Wed Jul 09 2014 - 09:17:51 EST
On Wed, Jul 09, 2014 at 06:38:22PM +0530, Amit Shah wrote:
> On (Wed) 09 Jul 2014 [07:53:17], Jason Cooper wrote:
> > On Sat, Jul 05, 2014 at 11:04:52AM +0530, Amit Shah wrote:
> > > Commit d9e7972619334 "hwrng: add randomness to system from rng sources"
> > > added a call to rng_get_data() from the hwrng_register() function.
> > > However, some rng devices need initialization before data can be read
> > > from them.
> > >
> > > This commit makes the call to rng_get_data() depend on no init fn
> > > pointer being registered by the device. If an init function is
> > > registered, this call is made after device init.
> > >
> > > CC: Kees Cook <keescook@xxxxxxxxxxxx>
> > > CC: Jason Cooper <jason@xxxxxxxxxxxxxx>
> > > CC: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> > > CC: <stable@xxxxxxxxxxxxxxx> # For v3.15+
> > > Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx>
> > > ---
> > > drivers/char/hw_random/core.c | 31 +++++++++++++++++++++++++------
> > > 1 file changed, 25 insertions(+), 6 deletions(-)
> > Thanks for cleaning this up!
> Any thoughts on the follow-up patch posted later that resolves some of
> the weirdness in init?
hmm, I'd rather see an init function for virtio-rng that checks the bit
and returns 0 or -EAGAIN. With your proposed change, you would get
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