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As a follow-up in the style of: 873be895ed ("udev: add USB revision in ID_PATH") this patch adds a second symlink for media controllers, this time including the USB revision. This means that in addition to persistent symlinks like: pci-0000:04:00.3-usb-0:1:1.0-media-controller -> ../../media0 We now also get: pci-0000:04:00.3-usbv2-0:1:1.0-media-controller -> ../../media0 ...which helps distinguish media devices plugged into different USB root hubs provided by the same PCI card, at least as long as they are for different USB revisions. Fixes: 04f19d6735 ("udev: Add /dev/media/by-path symlinks for media controllers")
Files in this directory contain configuration for systemd-udevd.service, a daemon that manages symlinks to device nodes, permissions of devices nodes, emits device events for userspace, and renames network interfaces. See man:udev(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of service itself. Use 'systemd-analyze cat-config udev/rules.d' to display the effective config.