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94a4093195
linux/drivers/acpi
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Zhang Rui 94a4093195 ACPI / thermal: do not always return THERMAL_TREND_RAISING for active trip points 
Commit 4ae46be "Thermal: Introduce thermal_zone_trip_update()"
introduced a regression causing the fan to be always on even when
the system is idle.

My original idea in that commit is that:
 - when the current temperature is above the trip point,
   keep the fan on, even if the temperature is dropping.
 - when the current temperature is below the trip point,
   turn on the fan when the temperature is raising,
   turn off the fan when the temperature is dropping.

But this is what the code actually does:
 - when the current temperature is above the trip point,
   the fan keeps on.
 - when the current temperature is below the trip point,
   the fan is always on because thermal_get_trend()
   in driver/acpi/thermal.c returns THERMAL_TREND_RAISING.
Thus the fan keeps running even if the system is idle.

Fix this in drivers/acpi/thermal.c.

[rjw: Changelog]
References: https://bugzilla.kernel.org/show_bug.cgi?id=56591
References: https://bugzilla.kernel.org/show_bug.cgi?id=56601
References: https://bugzilla.kernel.org/show_bug.cgi?id=50041#c45
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Matthias <morpheusxyz123@yahoo.de>
Tested-by: Ville Syrjälä <syrjala@sci.fi>
Cc: 3.7+ <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-04-26 13:34:40 +02:00
..
acpica ACPICA: Update predefined info table for _MLS method 2013-01-25 13:30:48 +01:00
apei Merge branch 'linux_next' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-edac 2013-02-28 20:42:33 -08:00
ac.c ACPI: Remove useless type argument of driver .remove() operation 2013-01-26 00:37:24 +01:00
acpi_i2c.c i2c / ACPI: add ACPI enumeration support 2012-11-23 12:23:40 +01:00
acpi_ipmi.c IPMI/ACPI: Add the IPMI opregion driver to enable ACPI to access BMC controller 2010-12-14 00:22:14 -05:00
acpi_memhotplug.c memory-hotplug: remove sysfs file of node 2013-02-23 17:50:13 -08:00
acpi_pad.c ACPI / acpi_pad: Used PTR_RET 2013-03-25 00:13:15 +01:00
acpi_platform.c ACPI / platform: Use struct acpi_scan_handler for creating devices 2013-01-30 14:27:40 +01:00
battery.c ACPI: suppress compiler warning in battery.c 2013-03-25 00:05:48 +01:00
bgrt.c efi: Fix the ACPI BGRT driver for images located in EFI boot services memory 2012-09-29 12:21:03 -07:00
blacklist.c acpi: delete module.h include from files explicitly not needing it 2011-10-31 19:30:33 -04:00
bus.c ACPI: replace kmalloc+memcpy with kmemdup 2013-03-24 23:31:33 +01:00
button.c ACPI: suppress compiler warnings in button.c 2013-03-25 00:05:48 +01:00
cm_sbs.c ACPI: Move definition of PREFIX from acpi_bus.h to internal..h 2009-08-28 19:57:27 -04:00
container.c ACPI: suppress compiler warning in container.c 2013-03-25 00:05:48 +01:00
csrt.c ACPI: add support for CSRT table 2013-01-19 22:16:21 +01:00
custom_method.c The sweeping change is to make add_taint() explicitly indicate whether to disable 2013-02-25 15:41:43 -08:00
debugfs.c acpi: add export.h to files using THIS_MODULE/EXPORT_SYMBOL 2011-10-31 19:30:34 -04:00
device_pm.c Merge branch 'acpi-scan' 2013-02-11 13:20:02 +01:00
dock.c ACPI / hotplug: Fix concurrency issues and memory leaks 2013-02-13 14:36:47 +01:00
ec_sys.c simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
ec.c ACPI: Remove useless type argument of driver .remove() operation 2013-01-26 00:37:24 +01:00
event.c acpi: add export.h to files using THIS_MODULE/EXPORT_SYMBOL 2011-10-31 19:30:34 -04:00
fan.c ACPI / fan: avoid null pointer deference error 2013-03-25 23:01:00 +01:00
glue.c ACPI / glue: Drop .find_bridge() callback from struct acpi_bus_type 2013-03-04 14:23:40 +01:00
hed.c ACPI: Remove useless type argument of driver .remove() operation 2013-01-26 00:37:24 +01:00
internal.h ACPI and power management fixes for 3.9-rc1 2013-02-25 21:25:17 -08:00
Kconfig ACPI: remove "config ACPI_DEBUG_FUNC_TRACE" 2013-04-08 14:05:41 +02:00
Makefile ACPI: add support for CSRT table 2013-01-19 22:16:21 +01:00
numa.c x86, ACPI, mm: Revert movablemem_map support 2013-03-02 09:34:39 -08:00
nvs.c ACPI / PM: print physical addresses consistently with other parts of kernel 2012-03-30 02:46:57 -04:00
osl.c ACPI: Fix wrong parameter passed to memblock_reserve 2013-04-24 13:50:17 +02:00
pci_irq.c PCI/ACPI: Don't cache _PRT, and don't associate them with bus numbers 2013-02-16 11:58:34 -07:00
pci_link.c ACPI / PCI: Make PCI IRQ link driver use struct acpi_scan_handler 2013-01-30 14:27:37 +01:00
pci_root.c PCI / ACPI: Don't query OSC support with all possible controls 2013-03-30 02:07:17 +01:00
pci_slot.c PCI changes for the v3.9 merge window: 2013-02-25 21:18:18 -08:00
power.c ACPI / PM: Take unusual configurations of power resources into account 2013-02-23 23:15:21 +01:00
proc.c ACPI / PM: Fix /proc/acpi/wakeup for devices w/o bus or parent 2013-01-27 21:40:11 +01:00
processor_core.c ACPI / processor: Remove redundant NULL check before kfree 2013-03-04 14:23:39 +01:00
processor_driver.c ACPI / porocessor: Beautify code, pr->id is u32 which is never < 0 2013-03-04 14:23:39 +01:00
processor_idle.c Merge branch 'misc' into release 2013-02-18 00:25:53 -05:00
processor_perflib.c acpi: Export the acpi_processor_get_performance_info 2013-03-06 10:00:34 -05:00
processor_thermal.c ACPI / processor_thermal: avoid null pointer deference error 2013-03-25 23:01:01 +01:00
processor_throttling.c ACPI: suppress compiler warnings in processor_throttling.c 2013-03-25 00:05:48 +01:00
reboot.c Revert "ACPI: ignore FADT reset-reg-sup flag" 2012-04-20 11:19:35 -07:00
resource.c ACPI: remove unnecessary INIT_LIST_HEAD 2012-11-27 13:49:36 +01:00
sbs.c ACPI: Remove useless type argument of driver .remove() operation 2013-01-26 00:37:24 +01:00
sbshc.c ACPI: Remove useless type argument of driver .remove() operation 2013-01-26 00:37:24 +01:00
sbshc.h
scan.c ACPI and power management fixes for 3.9-rc1 2013-02-25 21:25:17 -08:00
sleep.c ACPI / Sleep: Avoid interleaved message on errors 2013-03-04 14:23:39 +01:00
sleep.h ACPI: Drop power resources driver 2013-01-17 14:11:06 +01:00
sysfs.c ACPI sysfs: remove unnecessary newline from exception 2013-01-26 00:34:21 +01:00
tables.c ACPICA: Cleanup table handler naming conflicts. 2013-01-11 13:10:16 +01:00
thermal.c ACPI / thermal: do not always return THERMAL_TREND_RAISING for active trip points 2013-04-26 13:34:40 +02:00
utils.c ACPI: Add acpi_handle_<level>() interfaces 2012-11-21 23:20:22 +01:00
video_detect.c ACPI / video: Add "Asus UL30VT" to ACPI video detect blacklist 2012-11-30 13:02:50 +01:00
video.c ACPI: video: correct acpi_video_bus_add error processing 2013-04-25 12:53:19 +02:00
wakeup.c ACPI / Wakeup: Enable button GPEs unconditionally during initialization 2011-02-12 01:39:53 +01:00