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    Subject[PATCH 5.10 029/163] random: document add_hwgenerator_randomness() with other input functions
    Date
    From: Mark Brown <broonie@kernel.org>

    commit 2b6c6e3d9ce3aa0e547ac25d60e06fe035cd9f79 upstream.

    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/char/random.c | 11 +++++++++++
    1 file changed, 11 insertions(+)

    --- a/drivers/char/random.c
    +++ b/drivers/char/random.c
    @@ -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
    * ============================================
    *

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