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    SubjectRe: [PATCH][ATM] use rtnl_{lock,unlock} during device operations (take 2)
    Date
    > btw, you might get async device 'releases' more often than
    > you would like. some atm devices are usb and could be
    > unplugged during operation (yes, that's really bad but it
    > would be wise to be prepared for this.) i actually have
    > a cardbus atm interface. i might eject it accidentally.

    Right. In the speedtouch (USB ATM DSL modem) driver, when the
    device is unplugged I would have liked to be able to say to the
    ATM layer: I've gone, don't call me any more. But since there
    is no way to do this, instead I do:

    - refuse to open any more vccs; fail all attempts to send packets
    - call shutdown_atm_dev. This means that when the last vcc is
    closed, atm_dev_close will be called in my driver.
    - really shutdown in atm_dev_close

    In practice that means that the vcc remains open until pppd realises
    that the connection has gone down (no more echo requests getting
    through, for example). Maybe I should push a NULL skb down into
    each vcc to get it to close?

    Another thing: if the modem is plugged in again, and pppd relaunched,
    it would be nice if connections that were open when the modem was
    unplugged automagically recovered. Is that possible?

    Ciao,

    Duncan.
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