linux-kernel - [PATCH] random: Document add_hwgenerator_randomness() with other input functions

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Message-Id: <20200424123959.45559-1-broonie@kernel.org>
Date:   Fri, 24 Apr 2020 13:39:59 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Theodore Ts'o <tytso@....edu>
Cc:     linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH] random: Document add_hwgenerator_randomness() with other input functions

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@...nel.org>
---
 drivers/char/random.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 0d10e31fd342..ba2dc45bf718 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -228,6 +228,14 @@
  * particular randomness source.  They do this by keeping track of the
  * first and second order deltas of the event timings.
  *
+ * There is also an interface for true hardware RNGs:
+ *
+ *	void add_hwgenerator_randomness(const char *buffer, size_t count,
+ *				size_t entropy);
+ *
+ * This will credit entropy as specified by the caller, if the entropy
+ * pool is full it will block until more entropy is needed.
+ *
  * Ensuring unpredictability at system startup
  * ============================================
  *
-- 
2.20.1