linux-kernel - [patch] regulator: max77686: fix a shift wrapping bug

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Message-ID: <20150515092501.GB21508@mwanda>
Date:	Fri, 15 May 2015 12:25:01 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] regulator: max77686: fix a shift wrapping bug

We need to be able to handle more than 32 bits here because "id" can go
up to MAX77686_BUCK9 (34).  ->gpio_enabled is a u64 so that's fine
already.

Fixes: 3307e9025d29 ('regulator: max77686: Add GPIO control')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/regulator/max77686.c b/drivers/regulator/max77686.c
index 23b7c06..59b3210 100644
--- a/drivers/regulator/max77686.c
+++ b/drivers/regulator/max77686.c
@@ -121,7 +121,7 @@ static unsigned int max77686_map_normal_mode(struct max77686_data *max77686,
 	case MAX77686_BUCK8:
 	case MAX77686_BUCK9:
 	case MAX77686_LDO20 ... MAX77686_LDO22:
-		if (max77686->gpio_enabled & (1 << id))
+		if (max77686->gpio_enabled & (1ULL << id))
 			return MAX77686_GPIO_CONTROL;
 	}
 
@@ -277,7 +277,7 @@ static int max77686_of_parse_cb(struct device_node *np,
 	}
 
 	if (gpio_is_valid(config->ena_gpio)) {
-		max77686->gpio_enabled |= (1 << desc->id);
+		max77686->gpio_enabled |= (1ULL << desc->id);
 
 		return regmap_update_bits(config->regmap, desc->enable_reg,
 					  desc->enable_mask,
--
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