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

commit 1035a9e3e9c76b64a860a774f5b867d28d34acc2 upstream.

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>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hwmon/adm1029.c b/drivers/hwmon/adm1029.c
index 9ee5e06..39441e5 100644 (file)
--- a/drivers/hwmon/adm1029.c
+++ b/drivers/hwmon/adm1029.c
@@ -232,6 +232,9 @@ static ssize_t set_fan_div(struct device *dev,
        /* Update the value */
        reg = (reg & 0x3F) | (val << 6);
 
+       /* Update the cache */
+       data->fan_div[attr->index] = reg;
+
        /* Write value */
        i2c_smbus_write_byte_data(client,
                                  ADM1029_REG_FAN_DIV[attr->index], reg);