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authorPaul Fertser <fercerpav@gmail.com>2021-09-24 11:30:09 +0200
committerGuenter Roeck <linux@roeck-us.net>2021-09-24 13:59:10 +0200
commit2938b2978a70d4cc10777ee71c9e512ffe4e0f4b (patch)
tree018a9374d1c95e53b6c4ba1e53a877485f5eb9e9 /drivers/hwmon/tmp421.c
parenthwmon: (mlxreg-fan) Return non-zero value when fan current state is enforced ... (diff)
downloadlinux-2938b2978a70d4cc10777ee71c9e512ffe4e0f4b.tar.xz
linux-2938b2978a70d4cc10777ee71c9e512ffe4e0f4b.zip
hwmon: (tmp421) handle I2C errors
Function i2c_smbus_read_byte_data() can return a negative error number instead of the data read if I2C transaction failed for whatever reason. Lack of error checking can lead to serious issues on production hardware, e.g. errors treated as temperatures produce spurious critical temperature-crossed-threshold errors in BMC logs for OCP server hardware. The patch was tested with Mellanox OCP Mezzanine card emulating TMP421 protocol for temperature sensing which sometimes leads to I2C protocol error during early boot up stage. Fixes: 9410700b881f ("hwmon: Add driver for Texas Instruments TMP421/422/423 sensor chips") Cc: stable@vger.kernel.org Signed-off-by: Paul Fertser <fercerpav@gmail.com> Link: https://lore.kernel.org/r/20210924093011.26083-1-fercerpav@gmail.com [groeck: dropped unnecessary line breaks] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/tmp421.c')
-rw-r--r--drivers/hwmon/tmp421.c38
1 files changed, 28 insertions, 10 deletions
diff --git a/drivers/hwmon/tmp421.c b/drivers/hwmon/tmp421.c
index ede66ea6a730..8fd8c3a94dfe 100644
--- a/drivers/hwmon/tmp421.c
+++ b/drivers/hwmon/tmp421.c
@@ -119,38 +119,56 @@ static int temp_from_u16(u16 reg)
return (temp * 1000 + 128) / 256;
}
-static struct tmp421_data *tmp421_update_device(struct device *dev)
+static int tmp421_update_device(struct tmp421_data *data)
{
- struct tmp421_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
+ int ret = 0;
int i;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + (HZ / 2)) ||
!data->valid) {
- data->config = i2c_smbus_read_byte_data(client,
- TMP421_CONFIG_REG_1);
+ ret = i2c_smbus_read_byte_data(client, TMP421_CONFIG_REG_1);
+ if (ret < 0)
+ goto exit;
+ data->config = ret;
for (i = 0; i < data->channels; i++) {
- data->temp[i] = i2c_smbus_read_byte_data(client,
- TMP421_TEMP_MSB[i]) << 8;
- data->temp[i] |= i2c_smbus_read_byte_data(client,
- TMP421_TEMP_LSB[i]);
+ ret = i2c_smbus_read_byte_data(client, TMP421_TEMP_MSB[i]);
+ if (ret < 0)
+ goto exit;
+ data->temp[i] = ret << 8;
+
+ ret = i2c_smbus_read_byte_data(client, TMP421_TEMP_LSB[i]);
+ if (ret < 0)
+ goto exit;
+ data->temp[i] |= ret;
}
data->last_updated = jiffies;
data->valid = 1;
}
+exit:
mutex_unlock(&data->update_lock);
- return data;
+ if (ret < 0) {
+ data->valid = 0;
+ return ret;
+ }
+
+ return 0;
}
static int tmp421_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
- struct tmp421_data *tmp421 = tmp421_update_device(dev);
+ struct tmp421_data *tmp421 = dev_get_drvdata(dev);
+ int ret = 0;
+
+ ret = tmp421_update_device(tmp421);
+ if (ret)
+ return ret;
switch (attr) {
case hwmon_temp_input: