linux-kernel - [RFC PATCH 15/41] random: convert add_hwgenerator_randomness() to queued

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Date:   Mon, 21 Sep 2020 09:58:31 +0200
From:   Nicolai Stange <nstange@...e.de>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Alexander E. Patrakov" <patrakov@...il.com>,
        "Ahmed S. Darwish" <darwish.07@...il.com>,
        Willy Tarreau <w@....eu>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Vito Caputo <vcaputo@...garu.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.cz>, Ray Strode <rstrode@...hat.com>,
        William Jon McCann <mccann@....edu>,
        zhangjs <zachary@...shancloud.com>,
        Andy Lutomirski <luto@...nel.org>,
        Florian Weimer <fweimer@...hat.com>,
        Lennart Poettering <mzxreary@...inter.de>,
        Peter Matthias <matthias.peter@....bund.de>,
        Marcelo Henrique Cerri <marcelo.cerri@...onical.com>,
        Roman Drahtmueller <draht@...altsekun.de>,
        Neil Horman <nhorman@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Julia Lawall <julia.lawall@...ia.fr>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Andy Lavr <andy.lavr@...il.com>,
        Eric Biggers <ebiggers@...nel.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Stephan Müller <smueller@...onox.de>,
        Torsten Duwe <duwe@...e.de>, Petr Tesarik <ptesarik@...e.cz>,
        Nicolai Stange <nstange@...e.de>
Subject: [RFC PATCH 15/41] random: convert add_hwgenerator_randomness() to queued_entropy API

In an effort to drop credit_entropy_bits() in favor of the new
queue_entropy()/dispatch_queued_entropy() API, convert
add_hwgenerator_randomness() from the former to the latter.

As a side effect, the pool entropy watermark as tracked over the duration
of the mix_pool_bytes() operation is now taken correctly taken into account
when calulating the amount of new entropy to dispatch to the pool based on
the latter's fill level.

Signed-off-by: Nicolai Stange <nstange@...e.de>
---
 drivers/char/random.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 60ce185d7b2d..78e65367ea86 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -2640,6 +2640,7 @@ void add_hwgenerator_randomness(const char *buffer, size_t count,
 				size_t entropy)
 {
 	struct entropy_store *poolp = &input_pool;
+	struct queued_entropy q = { 0 };
 
 	if (unlikely(crng_init == 0)) {
 		crng_fast_load(buffer, count);
@@ -2652,8 +2653,9 @@ void add_hwgenerator_randomness(const char *buffer, size_t count,
 	 */
 	wait_event_interruptible(random_write_wait, kthread_should_stop() ||
 			ENTROPY_BITS(&input_pool) <= random_write_wakeup_bits);
+	queue_entropy(poolp, &q, entropy << ENTROPY_SHIFT);
 	mix_pool_bytes(poolp, buffer, count);
-	credit_entropy_bits(poolp, entropy);
+	dispatch_queued_entropy(poolp, &q);
 }
 EXPORT_SYMBOL_GPL(add_hwgenerator_randomness);
 
-- 
2.26.2