Rules with a single condition where a parent property is checked with != don't
work properly. E.g.:
SUBSYSTEMS!="usb", GOTO="end"
or:
ATTRS{idVendor}!="abcd", GOTO="end"
Instead, we can mix both those previous parent rules and match them:
SUBSYSTEMS=="usb",ATTRS{idVendor}=="abcd", GOTO="next"
GOTO="end"
LABEL="next"
# Apply rules here
LABEL="end"
In this case both SUBSYSTEMS and ATTRS conditions apply to the parent usb_device
(idVendor attribute is only available in the usb_device), so they apply to all
ports of the same device.
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