linux-kernel - [PATCH 08/23] hwmon: (adm1026) Fix setting fan

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Date:	Mon, 07 Feb 2011 00:23:00 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org
Cc:	Gabriele Gorla <gorlik@...guintown.net>,
	Jean Delvare <khali@...ux-fr.org>,
	Greg Kroah-Hartman <gregkh@...e.de>, Willy Tarreau <w@....eu>
Subject: [PATCH 08/23] hwmon: (adm1026) Fix setting fan_div

2.6.27.58-stable review patch.  If anyone has any objections, please let us know.

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

From: Gabriele Gorla <gorlik@...guintown.net>

commit 52bc9802ce849d0d287cc5fe76d06b0daa3986ca upstream.

Prevent setting fan_div from stomping on other fans that share the
same I2C register.

Signed-off-by: Gabriele Gorla <gorlik@...guintown.net>
Signed-off-by: Jean Delvare <khali@...ux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Willy Tarreau <w@....eu>

---
 drivers/hwmon/adm1026.c |   16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

Index: longterm-2.6.27/drivers/hwmon/adm1026.c
===================================================================
--- longterm-2.6.27.orig/drivers/hwmon/adm1026.c	2011-01-29 11:27:12.646064622 +0100
+++ longterm-2.6.27/drivers/hwmon/adm1026.c	2011-01-29 11:27:13.410065115 +0100
@@ -922,7 +922,7 @@
 	int nr = sensor_attr->index;
 	struct i2c_client *client = to_i2c_client(dev);
 	struct adm1026_data *data = i2c_get_clientdata(client);
-	int val, orig_div, new_div, shift;
+	int val, orig_div, new_div;
 
 	val = simple_strtol(buf, NULL, 10);
 	new_div = DIV_TO_REG(val);
@@ -932,15 +932,17 @@
 	data->fan_div[nr] = DIV_FROM_REG(new_div);
 
 	if (nr < 4) { /* 0 <= nr < 4 */
-		shift = 2 * nr;
 		adm1026_write_value(client, ADM1026_REG_FAN_DIV_0_3,
-			((DIV_TO_REG(orig_div) & (~(0x03 << shift))) |
-			(new_div << shift)));
+				    (DIV_TO_REG(data->fan_div[0]) << 0) |
+				    (DIV_TO_REG(data->fan_div[1]) << 2) |
+				    (DIV_TO_REG(data->fan_div[2]) << 4) |
+				    (DIV_TO_REG(data->fan_div[3]) << 6));
 	} else { /* 3 < nr < 8 */
-		shift = 2 * (nr - 4);
 		adm1026_write_value(client, ADM1026_REG_FAN_DIV_4_7,
-			((DIV_TO_REG(orig_div) & (~(0x03 << (2 * shift)))) |
-			(new_div << shift)));
+				    (DIV_TO_REG(data->fan_div[4]) << 0) |
+				    (DIV_TO_REG(data->fan_div[5]) << 2) |
+				    (DIV_TO_REG(data->fan_div[6]) << 4) |
+				    (DIV_TO_REG(data->fan_div[7]) << 6));
 	}
 
 	if (data->fan_div[nr] != orig_div) {


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