From: Kangjie Lu <kjlu@umn.edu>
To: kjlu@umn.edu
Cc: pakki001@umn.edu, Jean Delvare <jdelvare@suse.com>,
Guenter Roeck <linux@roeck-us.net>,
linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] lm80: fix a missing check of return value
Date: Fri, 21 Dec 2018 01:25:24 -0600 [thread overview]
Message-ID: <20181221072524.60369-1-kjlu@umn.edu> (raw)
When lm80_read_value() fails, the read data is an error number. So let's
check its status before using the read data.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
drivers/hwmon/lm80.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/hwmon/lm80.c b/drivers/hwmon/lm80.c
index fca6363cd77f..7457ff8bc860 100644
--- a/drivers/hwmon/lm80.c
+++ b/drivers/hwmon/lm80.c
@@ -628,6 +628,7 @@ static int lm80_probe(struct i2c_client *client,
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct lm80_data *data;
+ int rv;
data = devm_kzalloc(dev, sizeof(struct lm80_data), GFP_KERNEL);
if (!data)
@@ -640,8 +641,14 @@ static int lm80_probe(struct i2c_client *client,
lm80_init_client(client);
/* A few vars need to be filled upon startup */
- data->fan[f_min][0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
- data->fan[f_min][1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
+ rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
+ if (rv < 0)
+ return rv;
+ data->fan[f_min][0] = rv;
+ rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
+ if (rv < 0)
+ return rv;
+ data->fan[f_min][1] = rv;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, lm80_groups);
--
2.17.2 (Apple Git-113)
reply other threads:[~2018-12-21 7:25 UTC|newest]
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