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| author | Keith Packard <keithp@keithp.com> | 2015-03-18 00:17:00 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-03-18 21:01:31 +1100 |
| commit | 506bf0c0464ace57169aadcf02ae397999c57bdd (patch) | |
| tree | aee118b7cffedee93f827aa55dc7cb71f91d0e97 | |
| parent | 7094e8ea4da3077ad03eb027fd45a7617dba3d95 (diff) | |
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>
| -rw-r--r-- | drivers/char/hw_random/core.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index 83161dde53ee..571ef61f8ea9 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -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); |