linux-kernel - [PATCH 3.16 179/346] power: supply: max17042

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Message-ID: <lsq.1479082460.517326249@decadent.org.uk>
Date:   Mon, 14 Nov 2016 00:14:20 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        "Sebastian Reichel" <sre@...nel.org>,
        "Sven Van Asbroeck" <TheSven73@...glemail.com>,
        "Krzysztof Kozlowski" <k.kozlowski@...sung.com>,
        "Sven Van Asbroeck" <thesven73@...il.com>
Subject: [PATCH 3.16 179/346] power: supply: max17042_battery: fix model
 download bug.

3.16.39-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Sven Van Asbroeck <thesven73@...il.com>

commit 5381cfb6f0422da24cfa9da35b0433c0415830e0 upstream.

The device's model download function returns the model data as
an array of u32s, which is later compared to the reference
model data. However, since the latter is an array of u16s,
the comparison does not happen correctly, and model verification
fails. This in turn breaks the POR initialization sequence.

Fixes: 39e7213edc4f3 ("max17042_battery: Support regmap to access device's registers")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Sven Van Asbroeck <TheSven73@...glemail.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Signed-off-by: Sebastian Reichel <sre@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/power/max17042_battery.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

--- a/drivers/power/max17042_battery.c
+++ b/drivers/power/max17042_battery.c
@@ -295,13 +295,16 @@ static inline void max17042_write_model_
 }
 
 static inline void max17042_read_model_data(struct max17042_chip *chip,
-					u8 addr, u32 *data, int size)
+					u8 addr, u16 *data, int size)
 {
 	struct regmap *map = chip->regmap;
 	int i;
+	u32 tmp;
 
-	for (i = 0; i < size; i++)
-		regmap_read(map, addr + i, &data[i]);
+	for (i = 0; i < size; i++) {
+		regmap_read(map, addr + i, &tmp);
+		data[i] = (u16)tmp;
+	}
 }
 
 static inline int max17042_model_data_compare(struct max17042_chip *chip,
@@ -324,7 +327,7 @@ static int max17042_init_model(struct ma
 {
 	int ret;
 	int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
-	u32 *temp_data;
+	u16 *temp_data;
 
 	temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
 	if (!temp_data)
@@ -339,7 +342,7 @@ static int max17042_init_model(struct ma
 	ret = max17042_model_data_compare(
 		chip,
 		chip->pdata->config_data->cell_char_tbl,
-		(u16 *)temp_data,
+		temp_data,
 		table_size);
 
 	max10742_lock_model(chip);
@@ -352,7 +355,7 @@ static int max17042_verify_model_lock(st
 {
 	int i;
 	int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
-	u32 *temp_data;
+	u16 *temp_data;
 	int ret = 0;
 
 	temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);