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hwrng: core - allow perfect entropy from hardware devices

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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>
This commit is contained in:
Keith Packard 2015-03-18 00:17:00 -07:00 committed by Herbert Xu
parent 7094e8ea4d
commit 506bf0c046
1 changed files with 2 additions and 1 deletions
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3
drivers/char/hw_random/core.c
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@ -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);