linux-kernel - [PATCH 1/6] nvmem: sunxi_sid: Read out SID for randomness without looping

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190318073354.12151-2-wens@kernel.org>
Date:   Mon, 18 Mar 2019 15:33:49 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     linux-sunxi@...glegroups.com, Chen-Yu Tsai <wens@...e.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] nvmem: sunxi_sid: Read out SID for randomness without looping

From: Chen-Yu Tsai <wens@...e.org>

Since the reg_read callbacks already support arbitrary, but 4-byte
aligned. offsets and lengths into the SID, there is no need for another
for loop just to use it to read 1 byte at a time.

Read out the whole SID block in one go.

Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 drivers/nvmem/sunxi_sid.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/nvmem/sunxi_sid.c b/drivers/nvmem/sunxi_sid.c
index 570a2e354f30..704c35edf796 100644
--- a/drivers/nvmem/sunxi_sid.c
+++ b/drivers/nvmem/sunxi_sid.c
@@ -154,7 +154,7 @@ static int sunxi_sid_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct nvmem_device *nvmem;
 	struct sunxi_sid *sid;
-	int i, size;
+	int size;
 	char *randomness;
 	const struct sunxi_sid_cfg *cfg;
 
@@ -189,8 +189,7 @@ static int sunxi_sid_probe(struct platform_device *pdev)
 	if (!randomness)
 		return -ENOMEM;
 
-	for (i = 0; i < size; i++)
-		econfig.reg_read(sid, i, &randomness[i], 1);
+	econfig.reg_read(sid, 0, randomness, size);
 
 	add_device_randomness(randomness, size);
 	kfree(randomness);
-- 
2.20.1