Commit 506bf0c0 authored Mar 18, 2015 by Keith Packard Committed by Herbert Xu Mar 18, 2015

hwrng: core - allow perfect entropy from hardware devices



Hardware random number quality is measured from 0 (no entropy) to 1024
(perfect entropy). Allow hardware devices to assert the full range by
truncating the device-provided value at 1024 instead of 1023.

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

parent 7094e8ea

drivers/char/hw_random/core.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -179,7 +179,8 @@ static int hwrng_init(struct hwrng *rng)
		add_early_randomness(rng);

		current_quality = rng->quality ? : default_quality;
		current_quality &= 1023;
		if (current_quality > 1024)
		current_quality = 1024;

		if (current_quality == 0 && hwrng_fill)
		kthread_stop(hwrng_fill);