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PM: Update the policy on default wakeup settings

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This patch (as1485) documents a change to the kernel's default wakeup
policy.  Devices that forward wakeup requests between buses should be
enabled for wakeup by default.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Alan Stern 2011-09-26 17:38:50 +02:00 • committed by Rafael J. Wysocki
parent 37cce26b32
commit 8f88893c05
2 changed files with 6 additions and 2 deletions
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4
Documentation/power/devices.txt
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@ -152,7 +152,9 @@ try to use its wakeup mechanism. device_set_wakeup_enable() affects this flag;
for the most part drivers should not change its value. The initial value of for the most part drivers should not change its value. The initial value of
should_wakeup is supposed to be false for the majority of devices; the major should_wakeup is supposed to be false for the majority of devices; the major
exceptions are power buttons, keyboards, and Ethernet adapters whose WoL exceptions are power buttons, keyboards, and Ethernet adapters whose WoL
(wake-on-LAN) feature has been set up with ethtool. (wake-on-LAN) feature has been set up with ethtool. It should also default
to true for devices that don't generate wakeup requests on their own but merely
forward wakeup requests from one bus to another (like PCI bridges).
Whether or not a device is capable of issuing wakeup events is a hardware Whether or not a device is capable of issuing wakeup events is a hardware
matter, and the kernel is responsible for keeping track of it. By contrast, matter, and the kernel is responsible for keeping track of it. By contrast,

4
drivers/base/power/wakeup.c
View file

@ -276,7 +276,9 @@ EXPORT_SYMBOL_GPL(device_set_wakeup_capable);
* *
* By default, most devices should leave wakeup disabled. The exceptions are * By default, most devices should leave wakeup disabled. The exceptions are
* devices that everyone expects to be wakeup sources: keyboards, power buttons, * devices that everyone expects to be wakeup sources: keyboards, power buttons,
* possibly network interfaces, etc. * possibly network interfaces, etc. Also, devices that don't generate their
* own wakeup requests but merely forward requests from one bus to another
* (like PCI bridges) should have wakeup enabled by default.
*/ */
int device_init_wakeup(struct device *dev, bool enable) int device_init_wakeup(struct device *dev, bool enable)
{ {