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| author |   Michael S. Tsirkin <mst@redhat.com> | 2018-09-25 12:35:18 -0400 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2018-10-05 10:16:56 +0800 |
| commit | fae29f135ef4a86228d3ce13b61babf0d3031118 (patch) | |
| tree | e949847f12f61787a7dbb8a4d406fbe18c376ba4 /drivers/char/hw_random/core.c | |
| parent | crypto: ccp - Remove forward declaration (diff) | |
| download | linux-dev-fae29f135ef4a86228d3ce13b61babf0d3031118.tar.xz linux-dev-fae29f135ef4a86228d3ce13b61babf0d3031118.zip | |
hwrng: core - document the quality field
quality field is currently documented as being 'per mill'. In fact the
math involved is:
add_hwgenerator_randomness((void *)rng_fillbuf, rc,
rc * current_quality * 8 >> 10);
thus the actual definition is "bits of entropy per 1024 bits of input".
The current documentation seems to have confused multiple people
in the past, let's fix the documentation to match code.
An alternative is to change core to match driver expectations, replacing
rc * current_quality * 8 >> 10
with
rc * current_quality / 1000
but that has performance costs, so probably isn't a good option.
Fixes: 0f734e6e768 ("hwrng: add per-device entropy derating")
Reported-by: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char/hw_random/core.c')
| -rw-r--r-- | drivers/char/hw_random/core.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index aaf9e5afaad4..95be7228f327 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -44,10 +44,10 @@ static unsigned short default_quality; /* = 0; default to "off" */ module_param(current_quality, ushort, 0644); MODULE_PARM_DESC(current_quality, - "current hwrng entropy estimation per mill"); + "current hwrng entropy estimation per 1024 bits of input"); module_param(default_quality, ushort, 0644); MODULE_PARM_DESC(default_quality, - "default entropy content of hwrng per mill"); + "default entropy content of hwrng per 1024 bits of input"); static void drop_current_rng(void); static int hwrng_init(struct hwrng *rng); |