From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933195AbaHHVST (ORCPT ); Fri, 8 Aug 2014 17:18:19 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:41007 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757030AbaHHUvb (ORCPT ); Fri, 8 Aug 2014 16:51:31 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Axel Lin , Guenter Roeck , Kamal Mostafa Subject: [PATCH 3.13 064/259] hwmon: (adm1029) Ensure the fan_div cache is updated in set_fan_div Date: Fri, 8 Aug 2014 13:38:07 -0700 Message-Id: <1407530482-4483-65-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1407530482-4483-1-git-send-email-kamal@canonical.com> References: <1407530482-4483-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.13 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.13.11.6 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Axel Lin 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 Signed-off-by: Axel Lin Signed-off-by: Guenter Roeck Signed-off-by: Kamal Mostafa --- drivers/hwmon/adm1029.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/hwmon/adm1029.c b/drivers/hwmon/adm1029.c index 9ee5e06..39441e5 100644 --- 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); -- 1.9.1