From: Axel Lin <axel.lin@ingics.com>
Date: Wed, 2 Jul 2014 00:29:55 +0000 (+0800)
Subject: hwmon: (adm1029) Ensure the fan_div cache is updated in set_fan_div
X-Git-Tag: v3.2.62~70
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1df779f8b094895bce7636e211b620646aaba2cc;p=thirdparty%2Fkernel%2Fstable.git

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: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/drivers/hwmon/adm1029.c b/drivers/hwmon/adm1029.c
index 0b8a3b145bd24..3dbf4055a3b41 100644
--- a/drivers/hwmon/adm1029.c
+++ b/drivers/hwmon/adm1029.c
@@ -228,6 +228,9 @@ 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);