linux-kernel - [PATCH] Fixes: leds: lp50xx: Fix bank enable mask

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Date:   Tue, 14 Sep 2021 09:06:31 -0700
From:   DonDrews <donovancarldrews@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     pavel@....cz, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org, donovancarldrews@...il.com
Subject: [PATCH] Fixes: leds: lp50xx: Fix bank enable mask

Fixes an issue where previously 0 is used as a sentinel when
moving device tree configuration into the bank enable mask. This
prevented the first LED from being added to bank control.

Signed-off-by: Donovan Drews <donovancarldrews@...il.com>
---
 drivers/leds/leds-lp50xx.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/leds/leds-lp50xx.c b/drivers/leds/leds-lp50xx.c
index 401df1e2e05d..45f56caea182 100644
--- a/drivers/leds/leds-lp50xx.c
+++ b/drivers/leds/leds-lp50xx.c
@@ -347,17 +347,15 @@ static int lp50xx_brightness_set(struct led_classdev *cdev,
 	return ret;
 }
 
-static int lp50xx_set_banks(struct lp50xx *priv, u32 led_banks[])
+static int lp50xx_set_banks(struct lp50xx *priv, u32 led_banks[], int num_leds)
 {
 	u8 led_config_lo, led_config_hi;
 	u32 bank_enable_mask = 0;
 	int ret;
 	int i;
 
-	for (i = 0; i < priv->chip_info->max_modules; i++) {
-		if (led_banks[i])
-			bank_enable_mask |= (1 << led_banks[i]);
-	}
+	for (i = 0; i < num_leds; i++)
+		bank_enable_mask |= (1 << led_banks[i]);
 
 	led_config_lo = bank_enable_mask;
 	led_config_hi = bank_enable_mask >> 8;
@@ -413,7 +411,7 @@ static int lp50xx_probe_leds(struct fwnode_handle *child, struct lp50xx *priv,
 			return ret;
 		}
 
-		ret = lp50xx_set_banks(priv, led_banks);
+		ret = lp50xx_set_banks(priv, led_banks, num_leds);
 		if (ret) {
 			dev_err(priv->dev, "Cannot setup banked LEDs\n");
 			return ret;
-- 
2.17.1