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hwmon: (adm1029) Ensure the fan_div cache is updated in set_fan_div 

Writing to fanX_div does not clear the cache. As a result, reading
from fanX_div may return the old value for up to two seconds
after writing a new value.

This patch ensures the fan_div cache is updated in set_fan_div().

Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Cc: stable@vger.kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Axel Lin 2014-07-02 08:29:55 +08:00 committed by Guenter Roeck
parent df86754b74
commit 1035a9e3e9
1 changed files with 3 additions and 0 deletions
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3
drivers/hwmon/adm1029.c
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@ -232,6 +232,9 @@ static ssize_t set_fan_div(struct device *dev,
/* Update the value */ /* Update the value */
reg = (reg & 0x3F) | (val << 6); reg = (reg & 0x3F) | (val << 6);
/* Update the cache */
data->fan_div[attr->index] = reg;
/* Write value */ /* Write value */
i2c_smbus_write_byte_data(client, i2c_smbus_write_byte_data(client,
ADM1029_REG_FAN_DIV[attr->index], reg); ADM1029_REG_FAN_DIV[attr->index], reg);