linux-kernel - [PATCH][V2] leds: TI LMU: fix u8 variable comparisons with less than zero

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Message-Id: <20190522101745.21828-1-colin.king@canonical.com>
Date:   Wed, 22 May 2019 11:17:45 +0100
From:   Colin King <colin.king@...onical.com>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        linux-leds@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][V2] leds: TI LMU: fix u8 variable comparisons with less than zero

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

The u8 variables ramp_ups and ramp_downs are being compared to less
than zero, this will always be false.  Fix this by making the ramp
variables ints.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: 9a8e66ebeaa2 ("leds: TI LMU: Add common code for TI LMU devices")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---

V2: make u8 vars ints rather than removing the comparison. Thanks once
more to Dan Carpenter for spotting my clearly stupid V1 version and
correcting my mistake.

---
 drivers/leds/leds-ti-lmu-common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/leds/leds-ti-lmu-common.c b/drivers/leds/leds-ti-lmu-common.c
index adc7293004f1..c9ab40d5a6ba 100644
--- a/drivers/leds/leds-ti-lmu-common.c
+++ b/drivers/leds/leds-ti-lmu-common.c
@@ -84,7 +84,7 @@ static int ti_lmu_common_convert_ramp_to_index(unsigned int usec)
 int ti_lmu_common_set_ramp(struct ti_lmu_bank *lmu_bank)
 {
 	struct regmap *regmap = lmu_bank->regmap;
-	u8 ramp, ramp_up, ramp_down;
+	int ramp, ramp_up, ramp_down;
 
 	if (lmu_bank->ramp_up_usec == 0 && lmu_bank->ramp_down_usec == 0) {
 		ramp_up = 0;
-- 
2.20.1