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    SubjectRe: [PATCH] dvb: Allow MAC addresses to be mapped to stable device names with udev
    Date
    Sean Young <sean@mess.org> wrote:

    > > > Devices have a MAC address available, which is printed during boot:
    >
    > Not all dvb devices have a mac address.

    How do I tell? If it's all zeros it's not there?

    > Devices without a mac address shouldn't have a mac_dvb sysfs attribute,
    > I think.

    I'm not sure that's possible within the core infrastructure. It's a class
    attribute set when the class is created; I'm not sure it can be overridden on
    a per-device basis.

    Possibly the file could return "" or "none" in this case?

    > The dvb type and dvb adapter no is already present in the device name,
    > I'm not sure why this needs duplicating.

    They can be used with ATTR{} in udev rules. I'm not clear that the name can.

    > With this patch, with a usb Hauppauge Nova-T Stick I get:
    > ...
    > ==> /sys/class/dvb/dvb0.demux0/dvb_mac <==
    > 00:00:00:00:00:00

    I can't say why that happens. I don't have access to this hardware. Should
    it have a MAC address there? Is the MAC address getting stored in
    dvbdev->adapter->proposed_mac? Maybe it's not getting read - on the card I
    use it's read by the cx23885 driver... I think... The nova-t-usb2.c file
    doesn't mention proposed_mac.

    David

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