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random: document add_hwgenerator_randomness() with other input functions

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The section at the top of random.c which documents the input functions
available does not document add_hwgenerator_randomness() which might lead
a reader to overlook it. Add a brief note about it.

Signed-off-by: Mark Brown <broonie@kernel.org>
[Jason: reorganize position of function in doc comment and also document
 add_bootloader_randomness() while we're at it.]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Mark Brown 2021-12-01 17:44:49 +00:00 committed by Jason A. Donenfeld
parent 9bafaa9375
commit 2b6c6e3d9c
1 changed files with 11 additions and 0 deletions
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11
drivers/char/random.c
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@ -202,6 +202,9 @@
* unsigned int value);
* void add_interrupt_randomness(int irq, int irq_flags);
* void add_disk_randomness(struct gendisk *disk);
* void add_hwgenerator_randomness(const char *buffer, size_t count,
* size_t entropy);
* void add_bootloader_randomness(const void *buf, unsigned int size);
*
* add_device_randomness() is for adding data to the random pool that
* is likely to differ between two devices (or possibly even per boot).
@ -228,6 +231,14 @@
* particular randomness source. They do this by keeping track of the
* first and second order deltas of the event timings.
*
* add_hwgenerator_randomness() is for true hardware RNGs, and will credit
* entropy as specified by the caller. If the entropy pool is full it will
* block until more entropy is needed.
*
* add_bootloader_randomness() is the same as add_hwgenerator_randomness() or
* add_device_randomness(), depending on whether or not the configuration
* option CONFIG_RANDOM_TRUST_BOOTLOADER is set.
*
* Ensuring unpredictability at system startup
* ============================================
*