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@xxxxxxxxxxxxxxxxxxx>
---
Because of the unavailability of the linux-pm mailing list, I'm posting
this on LKML.
Documentation/power/devices.txt | 4 +++-
drivers/base/power/wakeup.c | 4 +++-
2 files changed, 6 insertions(+), 2 deletions(-)
Index: usb-3.1/Documentation/power/devices.txt
===================================================================
--- usb-3.1.orig/Documentation/power/devices.txt
+++ usb-3.1/Documentation/power/devices.txt
@@ -152,7 +152,9 @@ try to use its wakeup mechanism. device
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
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
matter, and the kernel is responsible for keeping track of it. By contrast,
Index: usb-3.1/drivers/base/power/wakeup.c
===================================================================
--- usb-3.1.orig/drivers/base/power/wakeup.c
+++ usb-3.1/drivers/base/power/wakeup.c
@@ -276,7 +276,9 @@ EXPORT_SYMBOL_GPL(device_set_wakeup_capa
*
* By default, most devices should leave wakeup disabled. The exceptions are
* 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)
{
--
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