Hi linux-pm, ChromeOS has a udev rule to chown the `power/wakeup` attribute so that the power manager can modify it during runtime. (https://source.chromium.org/chromiumos/chromiumos/codesearch/+/master:src/platform2/power_manager/udev/99-powerd-permissions.rules) In our automated tests, we found that the `power/wakeup` attributes weren't being chown-ed for some boards. On investigating, I found that when the drivers probe and call device_set_wakeup_capable, no uevent was being emitted for the newly added power/wakeup attribute. This was manifesting at boot on some boards (Marvell SDIO bluetooth and Broadcom Serial bluetooth drivers) or during usb disconnects during resume (Realtek btusb driver with reset resume quirk). It seems reasonable to me that changes to the attributes of a device should cause a changed uevent so I have added that here. Here's an example of the kernel events after toggling the authorized bit of /sys/bus/usb/devices/1-3/ $ echo 0 > /sys/bus/usb/devices/1-3/authorized KERNEL[27.357994] remove /devices/pci0000:00/0000:00:15.0/usb1/1-3/1-3:1.0/bluetooth/hci0/rfkill1 (rfkill) KERNEL[27.358049] remove /devices/pci0000:00/0000:00:15.0/usb1/1-3/1-3:1.0/bluetooth/hci0 (bluetooth) KERNEL[27.358458] remove /devices/pci0000:00/0000:00:15.0/usb1/1-3/1-3:1.0 (usb) KERNEL[27.358486] remove /devices/pci0000:00/0000:00:15.0/usb1/1-3/1-3:1.1 (usb) KERNEL[27.358529] change /devices/pci0000:00/0000:00:15.0/usb1/1-3 (usb) $ echo 1 > /sys/bus/usb/devices/1-3/authorized KERNEL[36.415749] change /devices/pci0000:00/0000:00:15.0/usb1/1-3 (usb) KERNEL[36.415798] add /devices/pci0000:00/0000:00:15.0/usb1/1-3/1-3:1.0 (usb) KERNEL[36.417414] add /devices/pci0000:00/0000:00:15.0/usb1/1-3/1-3:1.0/bluetooth/hci0 (bluetooth) KERNEL[36.417447] add /devices/pci0000:00/0000:00:15.0/usb1/1-3/1-3:1.0/bluetooth/hci0/rfkill2 (rfkill) KERNEL[36.417481] add /devices/pci0000:00/0000:00:15.0/usb1/1-3/1-3:1.1 (usb) Thanks Abhishek Abhishek Pandit-Subedi (1): power: Emit changed uevent on wakeup_sysfs_add/remove drivers/base/power/sysfs.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) -- 2.27.0.111.gc72c7da667-goog
