Re: [PATCH 2/2] hid2hci: when recovering from S3 use parent devpath

[Mario Limonciello <mario_limonciello@dell.com>]

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Hi Kay:

Kay Sievers wrote:
> On Tue, 2009-07-28 at 13:10 -0500, Mario Limonciello wrote:
> That should work (in theory) with the current logic. I can do here:
>
> $ UDEV_LOG=7 extras/hid2hci/hid2hci -p /devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.4 --method=dell --find-sibling-intf=01:01:00
> libudev: udev_device_new_from_syspath: device 0x60b0d0 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.4'
> libudev: udev_device_new_from_syspath: device 0x60b3d0 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1'
> libudev: udev_device_new_from_syspath: device 0x61c580 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1'
> libudev: udev_device_new_from_syspath: device 0x61c580 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0'
> libudev: udev_device_new_from_syspath: device 0x61c580 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.3'
> libudev: udev_device_new_from_syspath: device 0x61c580 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.3/2-1.3:1.0'
> libudev: udev_device_new_from_syspath: device 0x61c580 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.3/2-1.3:1.0'
> libudev: udev_device_new_from_syspath: device 0x61c580 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.3/2-1.3:1.0'
> libudev: udev_device_new_from_syspath: device 0x6205e0 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.3/2-1.3:1.1'
> libudev: udev_device_new_from_syspath: device 0x6205e0 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.3/2-1.3:1.1'
> libudev: udev_device_new_from_syspath: device 0x6205e0 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.4'
> libudev: udev_device_new_from_syspath: device 0x6205e0 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.4/2-1.4:1.0'
> libudev: udev_device_new_from_syspath: device 0x60c5a0 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.3/2-1.3:1.0'
> libudev: udev_device_new_from_syspath: device 0x60c850 has devpath '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1.3'
> libusb couldn't open USB device /dev/bus/usb/002/006: Permission denied.
>
> Where /dev/bus/usb/002/006 belongs to "2-1.3", which has a matching
> interface and is the sibling from "2-1.4".
>
> Can you try the same on the real hardware?
>   
Unfortunately I did try on real hardware, and it didn't work.  That's
what pre-empted my patch to try to use the parent's DEVPATH instead.

The problem is that the device is already gone (and not in the udev
database) by the time you call the command.

-- 
Mario Limonciello
*Dell | Linux Engineering*
mario_limonciello@dell.com


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