linux-kernel - [PATCH v4 5/6] hw_random: don't double-check old

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Message-Id: <1415030186-18303-6-git-send-email-akong@redhat.com>
Date:	Mon,  3 Nov 2014 23:56:25 +0800
From:	Amos Kong <akong@...hat.com>
To:	virtualization@...ts.linux-foundation.org
Cc:	kvm@...r.kernel.org, rusty@...tcorp.com.au,
	herbert@...dor.apana.org.au, m@...s.ch, mb@...sch.de,
	mpm@...enic.com, amit.shah@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH v4 5/6] hw_random: don't double-check old_rng.

From: Rusty Russell <rusty@...tcorp.com.au>

Interesting anti-pattern.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 drivers/char/hw_random/core.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index c31bf91..fc5de7d 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -480,14 +480,13 @@ int hwrng_register(struct hwrng *rng)
 	}
 
 	old_rng = current_rng;
+	err = 0;
 	if (!old_rng) {
 		err = hwrng_init(rng);
 		if (err)
 			goto out_unlock;
 		set_current_rng(rng);
-	}
-	err = 0;
-	if (!old_rng) {
+
 		err = register_miscdev();
 		if (err) {
 			drop_current_rng();
-- 
1.9.3

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