linux-kernel - [PATCH 3.2 25/94] hwmon: (adm1029) Ensure the fan_div cache is updated in set_fan

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Message-ID: <lsq.1407170911.12070490@decadent.org.uk>
Date:	Mon, 04 Aug 2014 17:48:31 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Axel Lin" <axel.lin@...ics.com>,
	"Guenter Roeck" <linux@...ck-us.net>
Subject: [PATCH 3.2 25/94] hwmon: (adm1029) Ensure the fan_div cache is
 updated in set_fan_div

3.2.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Axel Lin <axel.lin@...ics.com>

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@...ck-us.net>
Signed-off-by: Axel Lin <axel.lin@...ics.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/hwmon/adm1029.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/hwmon/adm1029.c
+++ b/drivers/hwmon/adm1029.c
@@ -228,6 +228,9 @@ static ssize_t set_fan_div(struct device
 	/* 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);

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