Re : [HW_RNG] How to use generic rng in kernel space

From: moreau francis
Date: Wed Aug 09 2006 - 06:00:30 EST

Michael Buesch wrote:
> On Tuesday 08 August 2006 17:39, moreau francis wrote:
>> Michael Buesch wrote:
>>> So, if you have a special hwrng on your embedded board and you
>>> have some special driver in that board, why not interface
>>> directly from the driver to the hwrng-driver?
>> This is what I'm currently doing. I was just thinking to use the
>> new HW-RNG layer and drop common code...
>>> This is all pretty special case.
>>> In the hwrng-driver you could still additionally do a
>>> hrwng_register() to export the functionality to
>>> userspace, though.
>> yes I would like to do that but there is a problem: I have no
>> access to "rng_mutex" to synchronise hw accesses and I'm
>> wondering if there's any issue to use a mutex in driver init
>> code.
> Use your own mutex or spinlock in the data_read callback
> and use that to serialize accesses to the hardware.

I think I miss something there but I need to lock this whole
sequence when reading a random data:


not only data_read callback. To do that I can only use "rng_mutex",
no ?



To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at