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linux/drivers/char/hw_random
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Michael S. Tsirkin fae29f135e 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: 0f734e6e76 ("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>
 		2018-10-05 10:16:56 +08:00
..
Kconfig hwrng: msm - remove msm hw_random driver 2018-07-27 19:04:30 +08:00
Makefile hwrng: msm - remove msm hw_random driver 2018-07-27 19:04:30 +08:00
amd-rng.c hwrng: amd - Revert managed API changes 2017-03-16 17:43:10 +08:00
atmel-rng.c headers: separate linux/mod_devicetable.h from linux/platform_device.h 2018-07-07 17:52:26 +02:00
bcm2835-rng.c hwrng: bcm2835 - Handle deferred clock properly 2018-02-22 22:16:21 +08:00
cavium-rng-vf.c hwrng: cavium - make two functions static 2018-03-09 22:45:34 +08:00
cavium-rng.c hwrng: cavium - make two functions static 2018-03-09 22:45:34 +08:00
core.c hwrng: core - document the quality field 2018-10-05 10:16:56 +08:00
exynos-trng.c headers: separate linux/mod_devicetable.h from linux/platform_device.h 2018-07-07 17:52:26 +02:00
geode-rng.c hwrng: geode - Revert managed API changes 2017-03-16 17:43:11 +08:00
hisi-rng.c hwrng: hisi - Add support for Hisilicon SoC RNG 2016-04-15 22:36:36 +08:00
imx-rngc.c headers: separate linux/mod_devicetable.h from linux/platform_device.h 2018-07-07 17:52:26 +02:00
intel-rng.c hwrng: printk replacement 2014-10-02 14:35:00 +08:00
iproc-rng200.c hwrng: iproc-rng200 - Add support for BCM7278 2017-11-10 19:20:12 +08:00
ixp4xx-rng.c IXP4xx: HW pseudo-random generator is available on IXP45x/46x only. 2012-11-22 03:35:39 +00:00
ks-sa-rng.c hwrng: ks-sa - add hw_random driver 2018-03-23 23:40:08 +08:00
meson-rng.c hwrng: meson - add clock handling to driver 2017-03-16 17:58:49 +08:00
mtk-rng.c hwrng: mediatek - Setup default RNG quality 2018-01-18 22:52:25 +11:00
mxc-rnga.c hwrng: mxc-rnga - add driver support on boards with device tree 2018-03-16 23:35:44 +08:00
n2-asm.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
n2-drv.c hwrng: n2 - fix spelling mistake: "restesting" -> "retesting" 2018-05-19 00:13:53 +08:00
n2rng.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nomadik-rng.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2014-04-03 09:28:16 -07:00
octeon-rng.c hwrng: octeon - Use devm_hwrng_register 2015-09-21 22:00:38 +08:00
omap-rng.c hwrng: omap - Fix clock resource by adding a register clock 2018-03-09 22:45:45 +08:00
omap3-rom-rng.c hwrng: omap3-rom - Handle return value of clk_prepare_enable 2017-05-23 12:52:03 +08:00
pasemi-rng.c hwrng: pasemi - Use linux/io.h instead of asm/io.h 2016-09-13 20:27:21 +08:00
pic32-rng.c hwrng: Make explicit that max >= 32 always 2016-11-21 22:50:45 +08:00
powernv-rng.c headers: separate linux/mod_devicetable.h from linux/platform_device.h 2018-07-07 17:52:26 +02:00
pseries-rng.c hwrng: pseries - constify vio_device_id 2017-09-22 17:43:05 +08:00
s390-trng.c s390/trng: Introduce s390 TRNG device driver. 2017-04-26 13:41:36 +02:00
st-rng.c hwrng: st - Fix missing clk_disable_unprepare() on error in st_rng_probe() 2016-09-13 20:27:24 +08:00
stm32-rng.c hwrng: stm32 - fix pm_suspend issue 2018-05-05 14:52:49 +08:00
timeriomem-rng.c hwrng: timeriomem - Remove 'max < 4' condition check 2017-09-22 17:43:14 +08:00
tx4939-rng.c hwrng: tx4939 - Use devm_hwrng_register instead of hwrng_register 2016-08-31 23:00:49 +08:00
via-rng.c hwrng: via - support new Centaur CPU 2018-04-21 00:59:03 +08:00
virtio-rng.c hwrng: virtio - Virtio RNG devices need to be re-registered after suspend/resume 2017-11-06 14:45:06 +08:00
xgene-rng.c hwrng: xgene - Convert timers to use timer_setup() 2017-11-03 22:11:16 +08:00