Commit 506bf0c0 authored by Keith Packard's avatar Keith Packard Committed by Herbert Xu
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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: default avatarKeith Packard <keithp@keithp.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 7094e8ea
......@@ -179,7 +179,8 @@ skip_init:
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);
......
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