linux-kernel - [PATCH 5.4 018/240] random: convert to ENTROPY

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Date:   Mon, 20 Jun 2022 14:48:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yangtao Li <tiny.windzz@...il.com>,
        Theodore Tso <tytso@....edu>,
        "Jason A. Donenfeld" <Jason@...c4.com>
Subject: [PATCH 5.4 018/240] random: convert to ENTROPY_BITS for better code readability

From: Yangtao Li <tiny.windzz@...il.com>

commit 12faac30d157970fdbfa171bbeb1fb88350303b1 upstream.

Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
Link: https://lore.kernel.org/r/20190607182517.28266-2-tiny.windzz@gmail.com
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/char/random.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -761,7 +761,7 @@ retry:
 			if (entropy_bits < 128)
 				return;
 			crng_reseed(&primary_crng, r);
-			entropy_bits = r->entropy_count >> ENTROPY_SHIFT;
+			entropy_bits = ENTROPY_BITS(r);
 		}
 	}
 }
@@ -1398,8 +1398,7 @@ retry:
 		goto retry;
 
 	trace_debit_entropy(r->name, 8 * ibytes);
-	if (ibytes &&
-	    (r->entropy_count >> ENTROPY_SHIFT) < random_write_wakeup_bits) {
+	if (ibytes && ENTROPY_BITS(r) < random_write_wakeup_bits) {
 		wake_up_interruptible(&random_write_wait);
 		kill_fasync(&fasync, SIGIO, POLL_OUT);
 	}