Re: [lm-sensors] [REGRESSION, ABI] Re: LMSENSORS: 2.6.26-rc, enabling ACPI Termal Zone support costs sensors

[Rene Herman <rene.herman@keyaccess.nl>]

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On 22-06-08 20:25, Rene Herman wrote:

> Another way to solve it _could_ be to just make up a device link if 
> something generic is available so that sensors doesn't trip over it
> in the first place but I don't know if that's a good option. You
> might.

This also works for me and, if correct, is ofcourse better than the 
CONFIG option. Wants a comment from the thermal_zone side (for which 
Zhang Rui seems the correct CC?) though.

Rene

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>From b51a5f4105f6b5ff52a2819a96dabe2ca3116128 Mon Sep 17 00:00:00 2001
From: Rene Herman <rene.herman@gmail.com>
Date: Sun, 22 Jun 2008 23:45:04 +0200
Subject: [PATCH] thermal: link the virtual/thermal/thermal_zoneN device for hwmon

2.6.26-rc gained a hwmon interface to the ACPI Thermal Zone
driver which unfortunately breaks lm-sensors 2 userspace and
renders all other (subsequent) hwmon sensors inoperable also.

Many systems, current slackware systems among them, are still
using lm-sensors 2 and would be affected.

The problem is userspace tripping over an absent "device"
link in the ACPI Thermal Zone sysfs /sys/class/hwmon/hwmonN
directory. This just adds the virtual "thermal/thermal_zoneN"
device as a device backlink which satisfies lm-sensors again.

Tested and looks fairly obvious, but this wants comment from
a thermal_zone person, to confirm/deny that this is a proper
device pointer to use here for one.

Signed-off-by: Rene Herman <rene.herman@gmail.com>
CC: Hans de Goede <j.w.r.degoede@hhs.nl>
CC: Zhang Rui <rui.zhang@intel.com>
CC: Mark M. Hoffman <mhoffman@lightlink.com>
CC: Jean Delvare <khali@linux-fr.org>
CC: linux-acpi@vger.kernel.org
CC: lm-sensors@lm-sensors.org
CC; linux-kernel@vger.kernal.org
---
 drivers/thermal/thermal_sys.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 6098787..c21e03c 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -357,7 +357,7 @@ thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 
 	INIT_LIST_HEAD(&hwmon->tz_list);
 	strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
-	hwmon->device = hwmon_device_register(NULL);
+	hwmon->device = hwmon_device_register(&tz->device);
 	if (IS_ERR(hwmon->device)) {
 		result = PTR_ERR(hwmon->device);
 		goto free_mem;
-- 
1.5.5