linux-kernel - [PATCH] misc: tsl2550: remove redundant initialization to variable r

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>] [day] [month] [year] [list]

Message-Id: <20200107175234.121298-1-colin.king@canonical.com>
Date:   Tue,  7 Jan 2020 17:52:34 +0000
From:   Colin King <colin.king@...onical.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] misc: tsl2550: remove redundant initialization to variable r

From: Colin Ian King <colin.king@...onical.com>

The variable r is being initialized with a value that is never
read and it is being updated later with a new value. Remove
the redundant initialization and move the declaration into a
deeper code block.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/misc/tsl2550.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/misc/tsl2550.c b/drivers/misc/tsl2550.c
index 09db397df287..6d71865c8042 100644
--- a/drivers/misc/tsl2550.c
+++ b/drivers/misc/tsl2550.c
@@ -148,16 +148,14 @@ static int tsl2550_calculate_lux(u8 ch0, u8 ch1)
 	u16 c0 = count_lut[ch0];
 	u16 c1 = count_lut[ch1];
 
-	/*
-	 * Calculate ratio.
-	 * Note: the "128" is a scaling factor
-	 */
-	u8 r = 128;
-
 	/* Avoid division by 0 and count 1 cannot be greater than count 0 */
 	if (c1 <= c0)
 		if (c0) {
-			r = c1 * 128 / c0;
+			/*
+			 * Calculate ratio.
+			 * Note: the "128" is a scaling factor
+			 */
+			u8 r = c1 * 128 / c0;
 
 			/* Calculate LUX */
 			lux = ((c0 - c1) * ratio_lut[r]) / 256;
-- 
2.24.0