The udevadm since systemd-220 doesn't show ATTRS anymore.

systemd-219: udevadm info --query=all --name=/dev/snd/by-path/pci-0000\:00\:02.0 --attribute-walk

...

  looking at device '/devices/pci0000:00/0000:00:02.0/sound/card0/controlC0':
    KERNEL=="controlC0"
    SUBSYSTEM=="sound"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:02.0/sound/card0':
    KERNELS=="card0"
    SUBSYSTEMS=="sound"
    DRIVERS==""
    ATTRS{id}=="Intel"
    ATTRS{number}=="0"

  looking at parent device '/devices/pci0000:00/0000:00:02.0':
    KERNELS=="0000:00:02.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="snd_hda_intel"
    ATTRS{irq}=="28"
    ATTRS{subsystem_vendor}=="0x1af4"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x040300"
    ATTRS{driver_override}=="(null)"
    ATTRS{consistent_dma_mask_bits}=="64"
    ATTRS{dma_mask_bits}=="64"
    ATTRS{local_cpus}=="1"
    ATTRS{device}=="0x2668"
    ATTRS{enable}=="1"
    ATTRS{msi_bus}=="1"
    ATTRS{local_cpulist}=="0"
    ATTRS{vendor}=="0x8086"
    ATTRS{subsystem_device}=="0x1100"
    ATTRS{d3cold_allowed}=="0"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""

systemd-220: udevadm info --query=all --name=/dev/snd/by-path/pci-0000\:00\:02.0 --attribute-walk

  ...

  looking at device '/devices/pci0000:00/0000:00:02.0/sound/card0/controlC0':
    KERNEL=="controlC0"
    SUBSYSTEM=="sound"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:02.0/sound/card0':
    KERNELS=="card0"
    SUBSYSTEMS=="sound"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:02.0':
    KERNELS=="0000:00:02.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="snd_hda_intel"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""