linux-kernel - [PATCH 3.4 06/22] hwmon: (adm1029) Ensure the fan_div cache is updated in set_fan

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Message-Id: <20140715231622.314011812@linuxfoundation.org>
Date:	Tue, 15 Jul 2014 16:17:11 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
	Axel Lin <axel.lin@...ics.com>
Subject: [PATCH 3.4 06/22] hwmon: (adm1029) Ensure the fan_div cache is updated in set_fan_div

3.4-stable 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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hwmon/adm1029.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/hwmon/adm1029.c
+++ b/drivers/hwmon/adm1029.c
@@ -231,6 +231,9 @@ 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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